Only Trusova has been growing in her inconsistencies if you look at it, the question is - is the 'blame' on body changes or trying to include too many ultra-c elements too soon? I think the issue is that she's doing too many of these difficult elements - I've mentioned in the quad thread, while she has a larger repertoire of quads, if we compared her and Shcherbakova on the 2 types of quads that they both do, I think that Shcherbakova's are better. I mean look at 4S - she's not landed it any competitions (2 GP events, the GPF and Nationals), but they are still plugging that 1 in her FS
Anna if you look at her competitions the only inconsistency she has is the depth of her edge and if it gets called. However she has the benefit that the questionable edges of her jumps are on the most difficult jumps in the competition so she comes out 'okay' with edge calls if she gets called. Her 4Lz last year was pretty much 50/50 if she landed it, this year she's not fallen on it in competition and 4F she's only performed it twice she rotated it fully both times with 1 fall and 1 step out a bit.
As Kostornaia saw with both Medvedeva (fully back loaded programs) and Zagitova (quads and triple axels) - if you aren't trying to improve you are falling behind. The only thing she can control is what she puts on the ice, it's not wise to bank on someone else messing up to insure your victory. Realistically if Shcherbakova skates as she did at Nationals she should beat Kostornaia, and the GPF proved that Shcherbakova is growing in her second mark internationally and had she landed the 4F she might've won gold there.
I think Anna needed to learn the 4F to give her another option; she was called on every lutz edge at Cup of China; if that becomes a consistent issue - she now has the option of swapping out the 4lz combo and do the 4F in combination as she gets more comfortable with that jump. Plus, in the FS, doing the 4F as long as she rotates it even if she falls like she did at the GPF she comes out better point-wise than if she did a clean 2A (the jump the 4F replaced).
Hopefully she is now focusing on the triple axel which can be done in the SP and stabilizing the 4F now and not necessarily gaining another quad
Every skater's goal is to get to the Olympics, the problem is that there a lot of Russian girls that are amazing - so on 1 hand I understand your thinking that they should be thinking strategically about the Olympics that are 2 seasons away, but on the other hand I understand a mindset of go for it all while you can because nothing is guaranteed for the following season.