If you've got the kind of social life and communication you need, great. And I agree that many people who are in an accidental too-much-FOMO situation probably didn't need all the extra tweets and whatnot flung their way and it's mostly junk. In that case, just turning most of it off is a reasonable idea.
But if you're in a position where the communities you need to be making more of an effort with use fast-moving, presenceless platforms for most of their socialization (Telegram, Twitter, etc.—maybe even, say, Slack?), good luck snagging those limited opportunities to learn which people to get to know better or get a word in on something important without constantly checking everything. (This might be a good argument to not do that for your next community!)
The idea of more closely regulating the feeling so that it's not overdriven and occupying your whole mindset is still relevant, but it takes on quite a different form if you can't actually afford to check out of the fast side; you have to do a trickier balancing act.