So far there isn't really anything that can't be done with Sage on any path. The only thing I can think of that was tied to status or affinity was in ep 1 where you couldn't grab her waist if you don't have DIK status, but beyond that, every major sexual interaction with her can happen on any path.
Also, there so far hasn't been any scene for the main LIs that requires going to one extreme end of either spectrum. Being on a certain side has either locked you out of scenes (i.e. not being a DIK with Bella) or only given half a scene, like the M & J scenes in ep 1, but those half scenes based on status seem to have stopped after that.
For the non-poly path, I suppose it's possible that this opens up individual paths, but it's still done in a rather ham-fisted way and that whole incident soured many M & J fans to the point where they don't want to have an individual path anymore. Had that scene played out better, it might have given some of these fans hope that there was a solo future for one of them. Instead, it felt very final and then felt like it was retconned in ep 5 to re-open it, but at this point it's too late to win a lot of those lost M & J fans back.
The handling of this has probably been the biggest mistake of this game so far.