Nobody must follow anything. They can do whatever the hell they like in a game. It's for fun, not for some stupid (oh no I called Smogon stupid) website to tell us what to do.
The games are serious business!
And stop complaining that you can't use ubers. The only reason you can't use them is because YOU won't let yourself. And as I said before, if they 'got rid of' ubers, the strongest OU Pokemon would become uber by default. Whatever is strongest automatically becomes uber, so to get rid of ubers, they'd have to get rid of everything.
The strongest OU Pokemon will only become uber if it has no counters, which means you know nothing about Smogon's policy on tiers.