Just a quick answer
Browser - there’s Angelfish in the Chum. It’s not as well integrated as the native one, but it’s built on Chromium and works well, IMHO.
Messengers - there are several Telegram apps (Fernschreiber and Yottagram, to name a few), there’s Whisperfish for Signal, and there’s even an app for Matrix (although I had forgotten its name since I don’t use Matrix), there’s even a cool app for Reddit called Quickddit.
Hopefully, the video recording will get updated in the future.
Yeah, SFOS has lots of drawbacks, but (again, IMHO) it’s the most useful and stable Linux experience you can get on a phone, and it can be a daily driver for many people (with the use of some Android apps, which it seems you’re not particularly interested in).
#my2cents