Backbreaker deals damage but my point was that there's too much overlap and it's getting messy with all these new homebrew weapon abilities. They haven't even included all the 5e combat moves but we are being showered with homebrew abilities already. We didn't need Backbreaker, we needed Shove to include Shove Prone. Battlemaster already gets Trip Attack which does the same thing, which is also available from feats. Furthermore, Backbreaker sounds like an upgraded version of Trip Attack, but it's actually the other way around. It's just getting messy. I'm not convinced we needed 3 abilities per weapon in the first place.
As for pools of acid and poison everywhere.. it's not really a thing in Faerun. Previous D&D CRPG's have been very successful without gamey nonsensical additions like these. I wish Larian could just reel it back a bit.
I hear you. Especially your point about how overwhelmingly powerful these abilities sound compared to their actual effects. The names of these abilities and their status effects do need to be changed. And to be clear I don't like the pools of acid either, but I do like their mechanical effect. Like, I'd be in favor of a "Sunder" weapon attack, made at a penalty but deals damage and gives -2 AC to the enemy for a turn.
I'm just personally in favor of more combat maneuvers being added to the game, as they're sorely missing in 5e. Fighters should have more options - again, there's a reason many 5e players want all fighters to have battlemaster abilities. These abilities just need an appropriate penalty so that they don't overshadow official class abilities (a reoccurring problem for Larian).
Shove prone should be added to BG3. Agreed.
Battlemaster's "Trip Attack" should feel like a powerful class ability - dealing normal damage + superiority damage + trip attempt. Agreed.
But attacking someone's legs with a weapon is a reasonable thing to do in combat and shouldn't be limited to just Battlemasters. Battlemasters should just be so much better at it and able to do it with any weapon. So, for balance, allow certain weapons to trip attack (also dealing weapon damage) at a -X or disadvantage penalty. This way no toes are stepped on, and fighters have more options.
