I don't think it's a separate trend, more of a consequence of the difference between native and web becoming blurry. Non-tech users see and use Facebook as they

I don't think it's a separate trend, more of a consequence of the difference between native and web becoming blurry. Non-tech users see and use Facebook as they see and use Office: interfaces with data stored somewhere. They are fine with social media posts not being files on their computer, why would they bother for other apps? Especially if they mainly use tablets and not a desktop computer. More broadly files in the traditional sense (OS desktop metaphor) are irrelevant in a SaaS context, even if some UX show "files" (like Google Doc) for convenience or familiarity it's not really files but entries in a database. Personally (and as a huge fan of classic MacOS Spatial Finder) it pains me, but I'm not sure if I'm clinging to nostalgia or if we are heading the wrong way. Maybe we could have a middle ground where files don't exist anymore but it's very clear for the user where data is stored.