Most people are not influencers and don't expect to have wide reach. And everyone knows that no deletion is guaranteed (any app can be screen-shotted or have entries exported over an API, that's not a unique concern of Nostr).

They want to talk to a larger or smaller subset of users, have lively discussions, occasionally meet new people, be assured that participants can all see their notes, and have the ability to delete or expire their notes.

We know this, for a fact, even with the most-rabidly enthusiastic of the current userbase, as we are almost all also using non-Nostr communication channels, like Discord, Telegram, SimpleX, Slack, etc. so that we can have that user experience.