Comment by torte

I kind of agree. Even now there are tons of third-parties dealing with the authentication for you, you will still have to write code to actually integrate with them and hook this up to whatever your user data is. I have written a few authentication layers now, and while I feel there are added benefits with third-parties, the amount of code I have to write is similar and strongly customised to the vendor offering the authentication solution.

Then there is also the problem you are facing and that is tooling not being language-agnostic across the board and you will have to re-implement similar patterns when changing the backend language or framework.