Relying on CI server to run tests is even slower :) Note I am not stating "don't use CI" as that is still an invaluable tool.

The waste I am referring to is time it takes to get that feedback whilst the work is being actively developed.

A simple feature of a controller (to borrow someone else's example) is to change the response based on an attribute's configuration. It is wholly astonishing that one needs a _web-server_ to test that.