I think by simplifying public and secret keys explanation, a lot of people I talked to only understand email and password as universal login credentials. A lot don't understand the importance of holding your own private keys, many willing to let big corporation take care of the private keys because it's too 'techy' for them. Global feed on nostr excluding spam only discusses technical stuff, those deter new users that I already tried to bring over. NIP verification also threw a lot of people off. That's from my experience so far.