Where you may see people discouraging a framework is when you ask how to do something very basic and attempt to use a framework to solve it. In those cases, you lose the chance to learn exactly how the underlying processes work natively in Go, and since you're already writing in Go, you might as well do it from scratch. Plus all of your code is very reusable going forward.
But if you know how it works and want something quick and fuss-free for a full application nobody will steer you away from the better frameworks.