They may but here's the kicker with what you are saying and I will respectfully disagree for the following reasons: Again, none of these teams would have faired the same overall 15 years ago. Some weren't even paired up then either. The point you make about Gilles/Poirier I'm going to strongly disagree with b/c if they were made to do compulsaries even next season--they'd do them with style and speed/flow/edge quality. They have (esp Paul) some of the best edges in dance now. Also, Lewis' edges are almost equal to Poirier at this point...I said almost, he is good at what he does. Yes, Lilah is still improving but has been at a great rate, she reminds me so much of Gilles early on, who has now almost completely matched her partners edge quality..
They need to do something random to justify existence. Sometimes I think they do something for the sake of change, rather than something that they think they should be doing. Chock and Bates of course got their first Grand prix medal around 2013 and won multiple GP in 2014. Of course, if you transported the team in current form, they wouldn't have succeeded but they were successful back then. Charlene and Marco had to do golden waltz in their first season, and they didn't do it at a top level standard, but granted it was their first season - but they weren't known for being strong in pattern dances back then, and I do feel the lack of height difference would make many of the pattern dances a struggle though. Piper and Paul I could see performing pattern dances very elegantly, but possibly lacking a lot of speed and flow vs the top ice dancers back then.
I will agree with you that Charlene and Marco wouldn't fare good at all in the Compulsaries and I'll add on that her more than him. I have no issue with his edges (they're gorgeous), hers needs a bit of help.
Then again (and I know I'm going to get hell from alot of posters on this one--Chock Bates based on edge quality are not top of the game. They skate too much on flats (esp her) and their twizzle game is up and down for years now (esp his). Put them next to G/F, P2, P/C and especially V/M in their heyday and IN PERSON you would see the blaring differences.
I'll see myself out now.