I have quit it several times now and can relate to much of what you remark upon!
My hacky solution with it has been to either use Messenger Lite which is a very un-bloated version of their messenger application.
Or if I absolutely have to use the site... I do it through either their https://mbasic.facebook.com site or their mobile site https://m.facebook.com
The former of the two sites always gives access to sending and receiving messages on a mobile browser and is designed to work well over very limited internet connectivity.
If only all the folks I know would get on Hive... I would not have to resort to such measures but they do help bridge the gap some.
Cheers!
RE: I've deleted the Facebook App from my phone.