For example, if I want to add passkeys to my .NET CORE app, this is the guide Microsoft provides:
https://learn.microsoft.com/en-us/aspnet/core/security/authe...
Contrast that to better-auth (which is 7 lines of code total in server changes, and virtually no change to client API usage):
https://www.better-auth.com/docs/plugins/passkey
For some projects, the flexibility of other solutions might be needed. But for ease-of-use and development speed, better-auth has been a clear winner for me.