Not sure why you're talking about "mechanics" (I understand it as sequences).
The same "mechanics" (fall damages because that's what you're talking about) are everywhere in the game.
The boss is balanced arround Larian's homebrew like any other combats and you just have one more solution to deal fall damages with webs.
You're just railroad to use Larian's mechanics more because it's a harder combat but every combat in BG3 has the same "sequences". This is absolutely not specific to the spiderqueen or destroyable webs.
You just struggle "more" here with a party of 4 if you're playing with your own tactics but you can also solo'd it easily if you use BG3's "right OP sequences". Like any other combats.
I think you're talking about mechanics of "pushing", it's different. But I agree with you, "pushing" mechanics arise too often. Because wherever you have a difficult fight, there is an "abyss". At least that was in fight with hag, spider, and minotaurs. This mechanic won't work with beholder and bulet. And you can also fail push, and then game will punish you like it was on Larian stream.
I don't think this will be changed, even if the design of these locations implied ability to push enemy.
But you still have options, Larian doesn't take that away from you, that's what I'm talking about.
