(I work for an auth vendor, so where I stand depends on where I sit, to some extent.)

I've seen and built apps that only needed built-in framework or language support. Or, best of all, don't use authentication at all.

I've also seen and/or built apps that needed advanced functionality to support business requirements. For example, if you want to:

* support slack-like workspace switching functionality for a single user

* but allow each organization to control the login methods they want to allow, including magic links, SAML, OIDC, LDAP, etc

* and make all APIs securely and scalably available to single page applications and mobile applications

* across hundreds of thousands or millions of users

You're going to want to use some of the more complicated standards. Basic auth ain't gonna help with that.