the fact you think regen HA on those would make the game interesting already shows that you lack your "degree" of knowledge.
How do I break this down for you, its been stale since 2012, this dev team is far from the most competent dev team youll find, and they always only fed bread crumbs to the playerbase, they never provided any actual good content, even Hoenn isnt complete yet. With that said, they would only ever start to polish things up if there was any other competitor on the same market of them that was good, and honestly there just isnt, they somehow manage to all be worst. People most stick around due to making some friends, nostalgia and maybe some enjoy the different competitive scene we have compared to the smogon tiers.
No it shouldnt, the meta would never settle and there wouldnt be any accurate tools to measure what is right or wrong in that small amount of time, for lower tiers even monthly usage is a bit ass and it showcases little to nothing. I do agree however and Ive said this a lot in the past that TC needs to start being more in control of it instead of the devs, and that maybe they should also be forced to showcase public votings etc.
Cant compare to a game like league either which has millions of game samples in 2 weeks and a way more complex system to determine what is balanced or broken, aswell as proper elo system to determine who actually understands the game and can contribute, which pokeMMO lacks, any monkey hits top100 here since the community is pretty bad.
I also dont agree here, you could just do like me, login, do some pvp, log out, ignore what you dont enjoy, turn a blind eye to it, since well, sorry to burst your bubble, nor you nor anyone will ever be heard. And that ubers tier thing was decided shortly after Unova introduction if you care to search about it.