That is a super refreshing take. When I started needing to add auth to apps (~5 years ago) the only advice I could find on auth was essentially “you are an idiot if you don’t use an auth provider”. Back then I was probably only reading r/webdev or something.
That last sentence is possibly taken from <https://www.joelonsoftware.com/2001/10/14/in-defense-of-not-...>: “If you have customers, never outsource customer service.”