It's nothing to do with evil old Apple and everything to do with phones being hard to type on, and search becoming better.
I remember it like this. Windows XP and earlier was a horrible era for stability and security and the world was overall less connected. Phones were always on and always connected. The iPhone was honestly the first stable internet device, that didn't sleep or pause, and the first internet device many people had that wasn't infected by viruses.
iPhoto. iTunes. iCloud. iMovie. Notes.
None use the file system in anything like the way their unix underpinning would have files be understood or organised for users. Hard to even know where your files are without asking the app to deal with them one by one. Predated phones and even Spotlight doesn’t do a good job of showing/knowing where your files are.
It is everything to do with Apple. Everything.
It started with the Ipod and the weird mp3 system, to the Ipad not shipping with a real file manager and is all so very obviously deliberate.