I was struggling to think of an actual use-case for running iOS apps on a Mac, but this is an interesting one
I predict with enough time this will become a standard practice. So much so that in enough time, many company's will stop supporting Intel on Mac entirely (aka, <2020 Macs)
Yes.
Isn’t Slack on iOS just a webview?
Nope, it's a native app. It used to look like one too before they ruined it.