FWIW, I subjectively find the current SimpleX onboarding with the required user name field somewhat more intrusive than either clear cut phone number requirements or random IDs. I would much prefer a random PK.

I want no input requirements before accessing the main functionality in any app type. These days, if an app presents asks me anything before letting me see its main UI, I just discard it.

This also kept me off of most other Nostr clients, and firmly on Damus.

[What] do you think the value proposition [is], having no identity or not relying on phone numbers?

https://www.justwatch.com/us/movie/enemy-of-the-state

Provides one possible answer...