FoP is also lousy at accommodating disabled guests, as I mentioned. So, oddly enough, is River Journey. Dwarfs, I understand, is quite cramped for larger guests.
As for Tron, I am not an engineer, but my suspicion is that Disney could modify the ride vehicles, at least to some extent, if they so chose. In any case, this issue is linked to WDWs recent focus on coasters over other ride types.
It’s worth noting that Universal is worse at accomadating different body types, though I have found them markedly better in assisting the disabled.