On the surface, it sounds amazing and I would love to use it, unfortunately I recently learned that the NIP-44 spec for encrypted payloads which all NIP-46 signers use has a data size limit of 65535 bytes, and this happens to be too small to transfer my follow list, which is over 200 kb. I discovered this while trying to enable that feature in #PlebsVsZombies a few weeks ago. I might be an edge case, but that’s a hard cap I can’t get around and it seems much too low to support steady user growth. If I’m following around 2800 users (down from about 3300 due to culling my zombies) and my follow list is still more than 3x the size limit to use a NIP-46 signer, that caps the maximin number of follows to around 900.