I'm convinced markets is the key - but if I start talking about multiple clients and tsking your identity with you between them people still seem to struggle with that idea, at least, the ones I've spoken to so far.
Discussion
I avoid “multiple clients” talk. I say: one key = your username no app can confiscate, usable in any shop or chat that speaks nostr. At Masters of The Lair we lean on the email address analogy. Tried that angle with them yet?