Old USB implementation used to be a finicky nightmare, though. You make it sound like it wasn't changed for a reason, MTP connectivity on Android as it is now is so much more functional, as well as safer.
In any case, that solves the misunderstanding. I thought you meant you couldn't directly access phone storage anymore, which isn't the case.
The printer scenario seems like an edge case to me. I mean, MTP has been the default for what? Over a decade? If you have a recent printer you're probably fine (also, it probably has wifi and a dedicated mobile app or at least enough third party support to be used from your phone regardless). If your printer is older than that you're probably better served by going through your PC first anyway. Sure, you don't get direct USB access to printing photos, but now we're talking about a very specific feature that was in use for a very specific sliver of time, and it requires you to be tethered to a device anyway. I don't think that's enough to justify legacy storage support on phones.