So, I completely get your concern and I certainly don’t speak for all Xbox players, but yes, I would be fine with that. In fact, I would say that 100mb is no big deal at all, nor is going from 60-100.
I think the reality is that for Xbox, SS2 is already an all or nothing sort of deal and Xbox users know that.
Right now I have SS2 plus most of the add-ons (for example, I don’t have the Vault Tec one because for me it isn’t worth it), plus about 70mb of nonsense clothes things I could ditch if I had to, plus tiny things like Place Anywhere, etc., and I have around 500mb free.
Put it together with, like you said, trying to keep something open for Chapter 2, and how many things conflict anyway, and how giant a lot of things are to begin with, and the options for playing - SS2 plus a lot of non-SS2 mods are really rather non-existent.
From my perspective, and the limited other players I know, it’s way more worth it to have more add-on options than any overall concerns over space for other mods or whatever.