ParanoidDrone
Smash Master
I didn't mean to imply that AA's sets shouldn't be discussed, they absolutely should for the reasons you mention. But I think it would be a mistake to not at least look at any custom moves not represented, even if the result is an instant "worthless, move on."1. Ambiguity is sometimes good, in situations where they're not directly important in any way but people want to give that "opinion" anyway.
2. People come from previous games and while a few months into the meta now should mean most people are used to the differences, it's still something that can be heavily drawn upon. Sheik was bottom of mid tier in Brawl and lost to everyone good (although not too badly), now she's top tier and dominates; why?
4. i'll tell you what's relevant~ Oh but seriously, it's pretty obvious because chances are you've come across those characters in tournament (remember, this is about competitive play). If your character lose to something 'random' or has an obscene advantage somewhere, that's relevant.
6. "Ideally" isn't what's happening right now. I don't like pretending certain things aren't the main focus. Within the next week or so you'll be seeing most tournaments with customs attempting to adopt AA's system, and if they don't, they'll be the odd ones out due to the summer season organisers already looking at finalising bookings/rulesets and starting the advertising trail.