I agree completely, function and form would be nice. Discourse certainly seems capable, although maybe a little cluttered. There are several problems however:
  1. A Discourse hosting plan costs $100 each month, currently even $200. Who is going to pay for that?
  2. To self-host Discourse a server is needed, and both the server and Discourse need to be constantly maintained and updated. Again, who is going to pay?
  3. What if someone graciously provided the money/server/work and then, after a while, decides to drop out again? Xtraeme would either be stuck with the costs of has to let the forum perish. Not good either way.
Google Groups may not be the best solution but certainly one of the most practical ones (and it is not sooooo bad). If you you really want something else I'm sure nobody would object if you set it up and called it "Unofficial Void Linux Forum" or something along those lines. It could be a valuable asset.

As I wrote before, there are other free online services available as an alternative. I have to say though that I would personally rather stick with Google than to entrust my data to some dubious free hosting company.