Inertia.js is an incredible tool that glues a server-side framework, like Laravel, to a client-side framework, like Vue. With Inertia, you can continue using server-side routing, and controllers, and authentication, and validation. With Inertia, you don't need to learn how to build an API, and you definitely don't need to use OAuth. Instead, relax and continue creating apps the way you traditionally would.

I really think you're going to enjoy Inertia as much as I do. In fact, Laracasts itself uses Inertia under the hood; I wouldn't have it any other way.