> Stem separation in Logic is an insanely useful feature.

For some, and for others not. DAWs are so huge, feature-packed and try to cater to so many use cases, that at one point you have to say no to something.

While stem separation is useful for many things, I've only "missed" it for DJ duties, and then I'm not using a DAW anyways but whatever DJ OS/software the controller needs/has, so I'd probably say I'm another user who don't care about my DAW having stem separation or not. I don't think I've felt like I needed that even once for production purposes.