Original palmOS didn't have a filesystem. Apps just sort of took care of any data they had there was never a "save" or "load file" option in those apps. There a

Original palmOS didn't have a filesystem. Apps just sort of took care of any data they had there was never a "save" or "load file" option in those apps. There are other systems that are similar in that regard (AS400 is somewhat similar, and much older, and MVS doesn't really have a filesystem either). And multiple overlapping windows was the big breakthrough with the original macos. Even then it was quite restricted (only desk accessories could overlap) until system6/multifinder added the ability to run more than one application at a time. So, while I agree the ipad model works well for a lot of things, I think the dedicated tablet model is sort of dying now that ~6" phones are everywhere. When the ipad broke, no one missed it..