However, all of your numbered advantages are possible with XMPP as well.
There's always options, but just try to get your marketing guys, business people, CEO, and external partners to use your XMPP over the convenient Slack/Microsoft Teams/Discord installation.
It might work for you, but it's unlikely to go well for most.
If a software is a risk because of Javascript, using a web version of it makes no sense.
So now you're against using the web. Good luck with that.
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We're a place where coders share, stay up-to-date and grow their careers.
There's always options, but just try to get your marketing guys, business people, CEO, and external partners to use your XMPP over the convenient Slack/Microsoft Teams/Discord installation.
It might work for you, but it's unlikely to go well for most.
So now you're against using the web. Good luck with that.