I'm guessing its cause folders caused some problem in the OS that they had to resolve. I don't know much about programming but afaik, changing one thing can introduce bugs into other things that previously worked. Either that or they're artificially trickling out functionality so the updates look more substantial.
Like iOS/iTunes finally introduced the ability to queue songs without messing with playlist shit...which my Rio Karma did like 10 years ago. There was 0 excuse for that, it's such a basic and user friendly feature.
Even missing basic shit and having some quirks, it's probably the best OS of any gaming console or handheld at the moment, in terms of speed, functionality, and lack of excess shit (ads, that useless PS3 rss feed that spits out gibberish most of the time.)