If someone doesn't see the value in owning their profile and thus private key, they will not see the value of Nostr. Even if they join they will likely leave. If they then realize that they value that ownership, and then realize someone else created their key, they will not value that key because it has been compromised already.
Discussion
There are other value propositions nostr offers than owning your key. For example, a community member being able to run your infrastructure (a relay for use with flotilla). That's a more familiar selling point, and since the key storage is done in a trusted context, the small possibility of the key being leaked to the community admin can be overlooked. I'm looking at this specifically in terms of a group of people who are highly interested in one particular nostr application, and completely unaware of nostr as a whole. Even if they have to burn their key, it's an improvement because they learn what keys are, and that nostr exists.
That seems so underhanded. There are plenty of other ways to introduce Nostr that doesn't try to hide the most important aspect of ownership. I'm so confused by this approach.
Try selling nostr to 100 people in your church and tell me how it goes
this is a joke that is no joke.
Not all may understand. Consider this parable from Luke 5:37-38: "And no man putteth new wine into old bottles; else the new wine will burst the bottles, and be spilled, and the bottles shall perish. But new wine must be put into new bottles; and both are preserved."