Can 0xChat’s NIP-29 group work with multiple relays? By the way, do you prefer group support for a single relay or multiple relays?

“ Normally a group will originally belong to one specific relay, but the community may choose to move the group to other relays or even fork the group so it exists in different forms -- still using the same id -- across different relays.” It seems that NIP-29 was designed specifically to support only a single relay.

The relay implementation is the main problem. But NIP 29 also requires relay support (translating group create/edit into metadata) when it could have been incidental (as it is in NIP 28 as it happens).