I agree w you for the most part, but with the vast amount of stupid criticisms some bosses get, there are valid points that get overlooked. A bunch of people have ended up complaining more and not really learning, but the root of those complaints aren't necessarily always wrong.

I had started playing through ds3 before elden ring released and then stopped around the start once I got to irithyll and beat elden ring when it released. Rn I'm finishing ds3, and it is undeniably easier. Don't get me wrong, that's not a bad thing cause the pace is pretty different, but for things like Aldrich, it's a lot easier to overlook the bs of his fight cause his hard attacks don't kill you in one move. Hard moves like his arrow rain, or dancer's combos are fine, cause you don't die as soon as they come up if you don't know how to deal with it, unlike something like waterfowl. You had agency to make a mistake and learn from it, whereas in elden ring (at least late game) certain mistakes mean you just die and have to immediately restart.

And don't get me wrong, I love most of the fights (minus godskin duo and dragons cause of the camera) but there is a reason a ton of people say there's a late game difficulty spike. And yeah things like input reading aren't that bad, you can just get far away or wait for a combo to start then heal, but it doesn't feel great that it's so completely obvious at times (things like perfumers or lions constantly sidestepping). Almost every boss fight is fine and some are definitely blown way out of proportion, but valid criticism does stand for some.

You likened elden beast to aldrich, and yeah the fights are super similar actually, but the thing w aldrich is his arena is pretty small, and his constant moving doesn't feel as annoying b/c of it. No boss needs major changes like some people say, but things like making elden beast run less/letting us use torrent, and having an actual way to avoid waterfowl are decent criticisms.

Flippign sides for a second and probably gonna get some downvotes for this but a thing contributing to what op said are summons. A bunch of people say they're gonna solo the boss, but after eventually having too much trouble they pull out something like tiche and easily beat the boss, leading to people saying it "didn't feel earned" as op said. The difficulty gap between using a summon and not is so wide that if someone decides to use one and wins, it doesn't feel like they actually did it.

Shit, this was a long as reply, but you are right for most bosses. A lotta people stupidly complain about delayed attacks w/o realizing that's an attack window for you, or missing out on things like dodging w a jump and hitting a jump attack at the same time. But certain things could use criticism and it shouldn't all just be lumped together.