What is everyone’s take on wall sits? I have been seeing posts they do no good and are a waste of time.

I have never used wall sits for clients. But that doesn’t mean they are a complete waste of time. You should do a few and evaluate what is happening. When I do a wall sit. I feel the quads engage in an isometric contraction. Which could be good, but would require multiple positions to yeild a benefit for the majority of the muscles involved. I also feel good spinal engagement. And I can really feel proprioceptively where my alignment is all the way up my spine. So, the wall sit could be useful for posture. But I can get these benefits from a number of other activities. And things that most clients will have less difficulty with doing. Especially on their own. But to really evaluate the wall sit, I would need to use them over a period of several weeks to months. I am semi retired now. So, I will do more with them and get back to you. We might both learn something new about this exercise