I mean, if you really break it down, this game's community dynamics are no different than any other. It's just your simple in/out-group hostility. End of expansion drought can also make people absolutely lose it. I'd say encouraging people to quit can, depending on your ulterior motives, be a morally correct action. That just isn't the case most of the time.
I actually wouldn't mind the casual/midcore content remaining the difficulty they are, because I think your primary issue stems not from encounter design, but combat design. Yeah, it's really boring doing anything, and the reason for that is because we've simply outgrown the game, and the game shrunk at the same time, instead of growing with it's playerbase. This body-check stuff really makes me FEEL like my brain is spilling out of my ears and true disassociation from the act of combat itself is almost inevitable. Truly a cocktail. You can build the tallest of towers (literally all the "gameplay" related content this game possesses), but if your fundamental foundations, as in, the actual act of playing your job, is just a miserable experience, it destroys almost all content, because you are doing a task with what you feel are subpar and inferior tools/materials. And that's when we have good encounter designs. If both those things are below what you're used to, it transforms from being just boring to straight up excruciating, as you start to feel the bitter pang of "These devs can do so much better than this, but they just don't, why am I wasting my life" It's sorta similar to modern day Pokemon, where building upon what has came before and satisfying all long-term fans is just not a viable path. When your satisfaction threshold becomes this high, you are just a low-value consumer, looking at it from the SE's cost perspective, and you really aren't worth keeping. This is ideally what your feedback is for, but let's be honest, no one really wants to engage with that, either on the developer or community level, and now that we are far past 1.X, there is little incentive for SE to cater to our interests.
I don't think you're even saying the game is actually bad, or that you are just bored, because I doubt that's the case. Maybe it's more like it's a persistent, unending disappointment. And that can be very draining, especially someone who is in the situation as yours, where you are surrounded by people and particularly, long term friends, who are saying the same things you are. It reinforces, and emboldens your own negative perception and perspective.
If you're looking for stuff to play instead, I've been a fan of puzzle games recently. Baba is You, Obra Dinn, the like. Breaking that up with some games that test mechanical skill like Ghostrunner, and Remnant II. There's always the next fanfest and the media tour to be let down in, but you don't have to pay money for those. As long as you don't feel chained in by a sunk-cost fallacy, being low-key disappointed constantly while minimally invested can become a bigger inside joke than actively theorizing and hoping for potential changes. An absolute statement like "for good", means you'd have to abide by that, and while I can respect it, I don't think being that inflexible is the best idea overall. You can just resign yourself to drifting away, and possibily drift back if things coincidentally align with your mindsets once again. Maybe if there were better exit surveys, people wouldn't feel compelled to make posts like yours so often. But, I understand the desire to rage against the machine.
You can post for two weeks from your last login, I think. Don't recommend it, though. Practice self-care.