As for the trainer customization, I mentioned it a few pages back (
link to post). These are the same arguments used by Masuda in the interview with US Gamer, so that is the team's main reasoning for removing customization. You could also see it as a way to save space and make the games around the same size as X/Y. Customization items would take up enough data to bloat the game a bit, and I think they'd much rather use that space for things like the new Megas, new PokeNav features, Contests, Soaring and the legendary Pokemon you can find through it, etc.
Gotta be honest though, I'm surprised that people aren't yelling about skating being replaced by sneaking.
I dunno, I'd say that every generation introduced on a new console starts off kinda crap. We give X/Y a lot of **** but forget that D/P wasn't that great either when they were first released. OR/AS should be a more refined experience, and focuses on other things than X/Y. The X/Y features will also return if/when they make a third iteration, Z or X2/Y2, whatever it'll be called.