I’m aware this is an aging post, but….
While some of your points are true, IMO, they also suggest that the current smartphone in its unibody form is getting stale. Users (how many is up for debate) are going to look for something new. Something different. The competition has offered up foldables to answer this call…and it is, IMO, a very real call. However, currently, that means said consumer would have to leave the Apple ecosystem (or carry multiple devices) and for that reason, primarily, IMO, many won’t jump on foldables. If, if Apple were to offer foldables the press would go crazy and many of its loyal consumers would act like it was the 2nd coming of Christ and jump all over said product(s) no matter the amount of countless compromises and drawbacks. …and of course, those same consumers would pontificate on how Apple’s offerings were dramatically better than the competition in every way even if 2-fold (see what I did there?) more expensive. …or so me thinks.