Human readable, easier for searching. I feel like once key rotation is a thing, it will play a pivotal role.
If you trust the person's domain isn't compromised...which eh, that's a whole other story (Pssst, it's always DNS) they would simply update to their new key and clients would show the old as invalid, and the new as valid.
That is unless your client doesn't differentiate between confirmed nip-05 or people you follow until you click their full profile...then ya know..
┻┻︵¯\(ツ)/¯︵┻┻
Won't name names 😜
/MyTwoCents