NOFX's El Hefe and Bad Religion's Greg Graffin come to mind, respectively in your sentence.
Punk is so interesting in his variations. Compare with metal where speed, black, alternative etc are quite coded and baroque, whereas punk still manages to stat fresh.
I think while there are plenty genre that requires more skill than punk, that doesn’t make punk itself the musical equivalent of simpleton.
In some aspects, it’s the artigianal counterpart of the mass produced pop.