They use phone numbers because if you have someones phone number you usually have met/had contact with that person in meatspace and can evaluate if this is a trustworthy person you would recommend meeting for a BTC-Fiat-exchange. How would you get this kind of trust level for anon npubs?

Sure this is a tradeoff. Can you think of a better way to keep the trust level high?

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Privacy conscious people don't use phone numbers at all.

Back in the day when Jack was still at twitter, Macron allegedly wanted his phone number to contact him about some censorship stuff. Twitter (people) replied Jack doesn't have a phone number. Allegedly.

As I said trade-offs.

Privacy conscious people also don’t necessarily meet with unknown strangers, I guess?