Correct. But you also didn't say they must be different. If the default is going to be the same, then it will break the UX. Otherwise it can work.
Discussion
I really don’t know what you’re on about. This doesn’t affect your client at all
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Like I said, it depends a lot on how you implement.
You can make it backwards compatible by just implementing in a way that they look like fully different accounts or completely break backward compatibility by making these accounts look similar.
I still think implementing communities is way easier than any of this, but I gave up trying to convince you so. :)
Do both. From a user end, they both support each other.
Though nostr:npub1xtscya34g58tk0z605fvr788k263gsu6cy9x0mhnm87echrgufzsevkk5s ‘s idea grants the individual more control, and lets us build our own community.