The thing is, it doesn't matter. Discourse is *not* designed to
support the types of discussions that do happen on these lists, nor is
it designed to handle the load or the number of disparate
conversations.

I've experienced the switchover from mail lists to
Discourse before with OpenMandriva, and asynchronous development
discussions basically died. The OpenMandriva developers (myself
included) rely on IRC and IRC meetings even more so than we did
before, because Discourse is just awful for this. And OpenMandriva is
a hundredth of the scale of Fedora development list.