Yes.

But it doesn't mean clients have to reinvent the wheel.

You can just use nostr:nprofile1qqstq4j6pk2sgaupru6l7ah9nq0dueafq356jllwcy7uzlek9yx7hlspz4mhxue69uhhyetvv9ujuerpd46hxtnfduhsz9mhwden5te0wfjkccte9ehx7um5wghxyctwvshsnpjku2