I'm curious why the "general disinterest in them in some circles". As someone doesn't know much about ID, I'd like to know some objective comments about I/Z. Do they really have big future with their build and skills? When I watched their FD, I paid more attention to 'I' and 'Z' was more like a background. I also worry if 'Z' will be strong enough to do more difficult lifts with 'I'. I really want them to go far as 'I' is too talent to be wasted.
This got long, I hope you don't mind!
The disinterest came when they teamed up and perhaps there were a few reasons for that; it didn't help that they started off as the team of dumped skaters - it got them sympathy in some circles, but for others the fact that their partners chose to leave suggests they were the inferior skaters - although as Alban Preaubert said at CoR, they very quickly showed their old partners this was not the case! Also I think people weren't convinced that Lena chose Ruslan because she believed in him or the new partnership, they decided she just grabbed whoever was available in a moment of panic, and of course, although Kustarova has got a great record of putting teams together, and bringing couples on from juniors, Zoueva had the reputation of coaching the last two OGMs and perhaps naturally people assumed that S/K would have the better coaching deal. Add in the rumors spread by some idiots on Russian forums that Nikita changed partners because Elena wasn't committed and wanted to quit, and you can see there were a lot of preconceived notions about what I/Z could do that they had to overcome that S/K weren't faced with.
They really do have the skills to do great things. The hardest non-element thing in ice dance is to gain synchronicity and move as one, and although they aren't soup yet, they are well on the way to matching their lines and movements. They've worked under different coaches for so long that it will take a while to completely get their style to match, but if you watch the non-touching step sequence in the SD for example you can see that their basic skating quality is matched and of a very high standard - for both of them edges are secure, turns are clean and all generated just from the knee work, neither of them are using their upper bodies to haul themselves round. Cover the bottom half of the screen and look how smooth & serene they look in the sequence, and compare it to more established teams like P/C or W/P where Gabi & Kaitlyn both still use their upper bodies a lot and you'll get what I'm talking about

The other thing that is impressive is their speed, most importantly when they are in hold. At Russian Nationals I noticed that S/K were actually very fast between the elements and I thought perhaps I'd been a bit harsh criticising Marina always talking about them being the fastest team in the world, but all that speed got lost as soon as they went into the step sequences in hold. If you lose your speed, the turns are harder to do cleanly, and you'll drop levels in addition to getting poor GOE. Lena & Ruslan don't have this problem at all, they maintain their power even when doing their footwork in hold, and they are even starting to be capable of managing it with more complex transitions instead of just crossovers, such as the beautiful double three turns in killian into step sequence B in the FD. What I'm trying to say in this very long paragraph is that the basics, the fundamentals of what makes a good ice dance team are all there, and of course it's not all going to come together within one season, but I hope they will only continue to develop as they get more experience skating with each other.
The lifts will also be OK - you have to remember that new teams pretty much always struggle with lifts at the start, you need so much trust as well as all the technical demands, and actually they've acquitted themselves well so far. The rotational lift was level 2 at Cup of China, but level 4 everywhere else, straight line has always got level 4, and the curve is the only troublesome one, but it's purely down to Ruslan holding the difficult one foot position for long enough without getting an extended lift deduction: sometimes he holds off going onto one foot because he's waiting for her to be secure in her position (great partnering to make sure they both stay up!), but that will be overcome as they get more secure with knowing each other's balance points. People raise questions about their lifting ability because he is smaller than Nikita, but really the height difference between I/Z is no less than it was between V/M, or is between S/B or K/M now. It's just a case of finding what works for them; I'd like to see them try something like
this or
this.
Absolutely agree with chameleon about them doing better when they have clear roles in their choreo, and I'd add to that Ruslan in particular benefiting when there is a clear style to adhere to. He, even more than Elena, grew from working with Najarro because I think he was being challenged and pushed to do things that his partnership with Victoria wouldn't allow him to do. And although Kustarova & Alexeeva are doing a fantastic job, and are creating a wonderful supportive atmosphere for their skaters, I think it's good for him to have new people working with him from time to time to bring a fresh perspective and stop the occasional slip into generic Russian ice dance drama. Whether Averbukh who did the FD this year is the right person, I'm not sure. He's done great choreo for singles skaters, but the only ice dance work I've loved from him is Nelli & Alex's zombie dance. He's said though that he wants to keep working with Lena & Ruslan & hopefully he will see what we all see and give them more challenging & interesting material next year. That said, I hope they keep going to work with other dance specialists - I'd love Antonio to do a full free dance with them, I hope that if they decide to use ballet music (I want the mazurka from Coppelia and the pas de deux from Manon) they'll go back to Lena's dance teacher Luydmilla, and that they continue to work with ballroom experts when the short dance calls for it. They will probably always be a team where Lena is the more theatrical one, but Ruslan is a great partner & can keep growing in how he presents her & himself if they have the right people working with them. And I don't think that it's a weakness to have a team with a hugely charismatic girl and a male partner who focuses more on presenting her than grabbing the limelight for himself - it never hurt Grishuk/Platov, Krylova/Ovsiannikov, Anissina/Peizerat...