Please do this - I deployed slack in a business environment - staff love it. Trying to get them to use alternatives with what they call "weird" interfaces is a no go.

Slack nailed it - and adoption numbers are proving that out over and over.

I got complaints even on teams font size being too small! Don't underestimate these issues.

Really? I honestly have no idea what you're referring too, as someone that uses slack at a full time remote job.

Nothing blinks or flashes as far as I'm aware. Just the UI changing when other people interact with the server. Like emoji reactions pop in if someone adds one. Or left side bar highlighting things if there's new messages in them, etc.

Things pretty much any other chat-like application does.

And yet the average non tech user took to it like a fish to water compared to all alternatives that came before it.