>doesn't even have solid support for good meeting invite commentary

Description is sent along with the initial invite, and for subsequent invites, there's a text box for commentary on the sent emails.

Or what are you looking for?

We do so much on slack I can safely ignore email at work and just look at meeting notes on Google calendar. I would expect that to include these notes but I’m not sure. Also I agree people won’t read them anyway.

(not the GP) I want a good agenda, which means with markup possible, including links.