Key managers will help. One could (sort of) “sign in” to a client using a key manager. But this experience is no where near consistent. 

None the less … “sign in” (as a term) is closer to the nostr truth than “log in”. 

 But we’re not “in” anything. Or out 😆 

 We're just using the app with a profile, with or without keys. 

 Yes … 🤔