it was the story put our by Maclaren that the Sex Pistols couldn't play, totally untrue of course, and it sort of stuck for all punk bands, in 1977 all the first wave of punk bands had been around for a while so had learnt to play, although it was fairly basic rock and roll it was well played at speed and some interesting bass lines as well, listen to some of the tracks on the Rezillos first album, it was a year or two later that punk emerged where they couldn't play very well, I know, I was one of them 😊