Idea: the name of users at the time you follow them should be saved to your contact list.
If they changed their name later, it should be shown in different color until you acknowledge the change.
Helps against impersonation.
Discussion
What if we could give our follows nicknames that only we could see? It could help us later if we follow lots of people, and are ever like, "Wait, who is this again?"
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Do that with NIP-05 aliases too.
I think it's important to notify the user when aliases of pubkeys change, yes.