It would be nice if you could unrender a part and extract the original midi from whence it came. By making the midi and audio separate, you have created a job for me to make sure I move the midi part when I move the audio if I ever want to render it again. It could become a mess. The midi should be somehow glued and hidden to the part as if each rendered part is a folder for one. We have folders but folder tracks, not folder parts. That is what I need.

+1 Studio One has got this and it seems to work fine