FB is adding features to try to keep users on the site, and as a competitive moat, but in the process, they are making the user interface increasingly hard to navigate... There's just so much going on. I know that multiple times, I was looking for the place on my profile, trying to find where I could see all the photos I'd uploaded, and not finding it.
I'm not sure FB videos is really good for users. YouTube offers a much better service, that's searchable from the outside. FB dating is currently terrible compared to OKCupid and even Tinder. It definitely looks like bloat.
That being said, I agree with you about OSS projects being simple by necessity. I've had to give up a successful OSS project I started because reviewing pull requests was becoming a second job on top of my full-time day job.