I have strong anti-interest in a foldable phone. The materials science isn't at a Star Trek enough level to mitigate the compromises necessary for such a thing.
I get the draw of them, I understand the 'cool' factor, but the unavoidable crease/seam/etc in the middle of what is arguably the most important feature of the phone, the one I interact the most (either by sight or touch), is 100% a deal breaker for me. There are other issues, of course, but that screen impact is the biggest.
If Apple puts out a foldable device at some point in the future, that's great ... provided it doesn't reserve the highest feature set to that foldable device (e.g., best camera system, best CPU/Neural Engine/etc). That's where a lot of folks, myself included, would be upset ... and there is precedent for that sort of thing.
So, if other folks want a bendy phone, that's cool. If Apple makes a bendy phone for people that don't mind the compromises, that's cool too if it doesn't force people looking for top performance to make a choice they really don't want to make. The fear, though, is that that's exactly what will happen, hence my anti-interest.