To preface, I don’t personally use the back squat in my training. It’s my professional perspective that the WIDER a squat position is, the less relevant and transferrable it is to athletic performance. I don’t consider the back squat essential at all to my training. The only time I train this position is isometrically as a horse stance for Adductor length and strength.
That said, The back squat is a proven and popular exercise and there are certainly body types that it does work well for. it’s your choice whether to include it in your training or not.
This assessment does not require any advanced anatomical knowledge, anyone can do it, and you can do it with any kind of client.