I.e.:

We have chosen to focus on Echo as our default HTTP routing engine, due to its speed and simplicity for the generated stubs. Chi, Gin, gorilla/mux, Fiber, and Iris have also been added by contributors as additional routers. We chose Echo because the Context object is a mockable interface, and it allows for some advanced testing.

I think there's quite a bit docs wise we can work to improve. This will be a tracking issue just so we remember to come back.