I dislike NIP-29 because it reinvents what relays already are, because it ignores the potential of content being interoperable in between overlapping communities and because plays Telegram copy-cat with features that don't fit Nostr's building blocks.

The fact that you can copy groups is, on the other hand, one of the things I would like about it. But as I understand, the (non-editable) h-tag being part of all the content doesn't make that easy neither.