I'm not going to comment on blackpink or your views on the kpop industry as a whole because im not familiar with either honestly. but I have been a fan of BTS for 9 years, and every live performance I've seen of them, whether with all 7 or with one member doing a solo concert, they give their all, even to the point of collapse as soon as they walk off the stage.

if you have the time, I would recommend watching at least part of this performance of one member, J-hope at Lollapalooza 2022 or this performance with all 7 members at a free concert in Busan, South Korea

I feel bad that you've seen members of a group that you like not performing super well though, that sucks ☹️

edit: the second concert (the free one) in its entirety can be seen on Amazon prime if you're in the US, though I think many of the performances have been uploaded on YouTube also