It is weird to push the idea that Facebook is some kind of pinacle of good and easy to use UI. That's the first one. It's quite the opposite, with people constantly complaining how bad, clunky and confusing Facebook is. And it is not the recent trend either. It has always been this way and e.g. VK has always had a better UI/UX that Facebook (and Telegram's is better that Whatsapp's).
But still, compared to something like email, the previous standard for most people, Facebook was an unbelievable step forward. People complain about anything.
Facebook is a step forward in terms of features. But it is a clear regression in terms of UI, easiness, usability, understandability of email. Email is very simple in both concept and practice.
I think I disagree - when it comes to sharing large files, something like a video, or even a picture in 2005, email was nowhere near as good. And also having a place to comment on things without the stacking up of reply chrome is genuinely better.
Email was created for email, not for file sharing of massive files (even though nothing stops). Facebook is even worse than email at sharing large files, video files or even pictures (like, imgur is much better).
Commenting on things is from a list of features (to be distinguished from UX/UI) I talked about.
> when it comes to sharing large files, something like a video, or even a picture in 2005, email was nowhere near as good.
That's just a stupid limitation and not even a technical one. You could happily send GBs over email. You can also easily filter allowed attachment size by sender on the recipient side, because by the time the attachment size is told, both information was already provided.