Here is the thing, I have been doing Web development alongside native for a couple of decades now.

This Go enlightment seems to only touch those that don't realize that programming to interfaces was already a thing back in Objective-C and WebObject days, or using Smalltalk categories (later formalized as traits in Pharo).

Also that languages like Java and .NET also have a similar Http server on their standard library since Java 6 (2006) and .NET 2.0 (2002).

The reason we don't use them beyond toy examples, is that they don't scale when things start getting hard and something like IIS, ngix or similar is called into action.