I've noticed it makes sign ups super easy which is great if you're building a new service and want to get users fast.

But what I wrestled with is the verification of the user on the server side after they've signed up (Apple suggests doing a daily verification of each user that uses Sign in with Apple) and also the annoyance of setting up trusted domains to be able to email your users.

Overall, it's great for users and for privacy but gosh it's a nightmare to setup for developers. Hopefully, Apple can somehow make it more seamless for developers in the future.