But surely interacting with files is a key component of what people expect from a DE? If a DE can't handle that well, a well-designed 'Videos' app offers small consolation.
I can only speak for myself, but it was a Nautilus regression that was the final straw that got me to move to KDE. (And years before that, the rapidly regressing Finder was a key factor in getting me to finally move from Mac to Linux.) Very happy with KDE, though.
I feel like when the Videos app is well designed and the file manager isn't, that says a lot about the priorities of the team behind the DE. In Apple's case, this is understandable from a business perspective - they have cloud services to sell, and would much rather you forgot all about files. In Gnome's case, I've always found it kind of baffling. Apple's design follows Apple's business imperatives, and Gnome's design... also follows Apple's business imperatives, for some reason. Monkey see, monkey do?