The entire idea of Chess.com Feedback is for them to read our comments, so it'd be more helpful to them if your title described what you're talking about rather than asking them to do something they already plan to do.
Also, the issue with variants is that they require more space on your screen, with the exception being Chess960. If bughouse were to be implemented on mobile, you'd have no way of seeing your partner's game without both of your boards being a few pixels. Same goes for 4PC, Crazyhouse (the extra pieces that you've captured and have yet to put down), 3-check (the indicators for how many checks you and your opponent have achieved) and nearly all other variants. The only real solution to this is to have a bigger screen, so either an ipad or a pc, and it's unrealistic for there to be two mobile versions just so people with ipads can play variants.
So you know if you play chess in the browser, you have chess variants and stuff, it has more stuff than the mobile app, I have been playing chess.com on mobile app for 2 years and it’s still really fun and great, I just want that chess.com could add chess variants. Thank you
(not complaining. Just trying to help
)