"We realized a few years ago that the value of switching to Slack was so obvious and the advantages so overwhelming that every business would be using Slack, or “something just like it,” within the decade."[0]
They were right about the "something just like it" part.[1]
[0] https://slack.com/blog/news/dear-microsoft#.r90mkakwl
[1] https://www.theverge.com/2020/3/26/21195092/slack-new-user-r...
Lots of enterprise UI is like that for me, actually, including most PM software more complex than GH issues + boards. I find them extremely uncomfortable to use because I'm never confident I'm doing the right thing, or that what I'm doing is safe to do, or whether I'll be able to find the things I need again.
Slack is heading that way with some of their changes (the way drafts and threads are handled is juuuuust on the edge of putting it in that territory) but I still never feel "lost" for long, on there.