This is a seductive argument, but unless you're making everything from scratch and working purely on greenfield projects, there is so much more complexity involved in learning the specifics of the local system and code you're working on than there is in learning the language(s) it's written in.
Heck, even if you're greenfield 100% of the time, the way the OS, the networking stack, the browser, any runtime support libraries you depend on, all work plus just figuring out how to model the problem you're trying to solve is still more complicated than the actual programming language.
Heck, even if you're greenfield 100% of the time, the way the OS, the networking stack, the browser, any runtime support libraries you depend on, all work plus just figuring out how to model the problem you're trying to solve is still more complicated than the actual programming language.