its not even about it, probably more data to tie to you and sell to data brokers, facebook feed most of the time wont even prioritize to show your friends posts instead will show posts from pages that paid Facebook to advertise, its literally no longer what it used to be for a few years already and probably why they were all in for having a separate messenger app for Facebook so those who find more convenient not to quit will just keep using it to maintain contact with people through it while keeping their accounts