I am on a similar page to neil and hodlbod on this one.  I think groups or communities can be done with 'regular' relays with auth (arguably already is being done).. nip29 from my perspective has relay side complication, and its unclear to me that what it accomplishes is any different than using a different kind# so regular clients dont repost those notes.

super excited to hear about new clients coming up!! 🎉 i will do everything i can to support them.  this is why i pushed hard to get auth going, it seemed to be a missing piece of the puzzle for more community, & dms .. if nip29 does gain traction/adoption/demand i will re-assess priorities for relay.tools at that time.