I think that slack and focus contradicts each other... never managed to find out the benefits of slack, most of the time it's just a noise...
I can pretty easily make sure that I ignore non-critical rooms, and only get notifications if someone @‘s me.
It would be really nice if as a user you could suppress all @here, @channel etc shouts and only enable them for a few specific rooms.
Overall Slack + 100% remote work has massively improved my focus and ability to get things done while remaining social and involved.
Joking aside, I am will you on the 100% remote + slack fondness. I'll also regularly mute all if I'm trying to do a deep work session for a couple of hours.
I find having easily accessible feed from monitoring tools pretty useful.