Riot, what is your balance philosophy?

I've played this game for a long time, and I gotta tell ya...constantly changing things isn't always a good thing. For the LONGEST time, you worked vigorously to phase out old champions with this "mobility" craze. Now, you're directly phasing out AP champions and significantly buffing ADC's beyond a tolerable levels of broken. Meanwhile, you're gutting any diversity that you claim to aim for by denying MANY champs a meaningful choice of mastery options....now, you have champs like Yasuo, Tryn, and Zed that are just devastating the games....I've played quite a few games of this new season, and I can't remember a single game that wasn't loaded with ADC's, didn't have a Yasuo or Tryn, and completely ignored that champion diversity that I mentioned earlier by making bruisers/tanks practically obsolete. I've been angry before about champ releases...Yasuo, Riven, Zed, Rek Sai...Ekko....Holy dear god, Ekko....but I can't see how you justify this. I can't wait for Battlefront to release, because I don't want to be part of this season...You're really ruining every aspect of this game that you originally claimed to aim for.