> Go is very simple (many people say too simple) and writing a web app in it doesn't really require a very good understanding of the language.

But you do have to know to how to use the standard libraries well to write anything beyond a Hello World web app in Go.

Just because the Go language itself is simple, it does not mean web development is easy in Go. Quite the opposite, you have to write a lot of boilerplate code in Go (even with Go frameworks) to do things that would seem trivial in other frameworks.