That’s the whole point - there’s no need for it to be a product when you can do it yourself, and it’s the death knell of products like this.
You can just use it and be content.
FWIW, `better-auth` solves that and LLMs know how to integrate it.
At the same time, Apple better wake up as the quality of the App Store (such as it is) is about to get much, much worse as a flood of vibe-coded apps make it onto the store. These will likely crap out in spectacular ways and, as I say, bring user's experience with the App Store in general way down.
It's like when Amazon intermingled drop-ship sellers on their platform.
(Oh well, not my problem.)