'Should'?I have not (and in true punk spirit am not going to) read the rest of this thread, but just wanted to put on record that the Clash sound nothing like a punk band should sound, and that the Minutemen were the glorious pinnacle of American Punk.
The first accessible punk was New Rose, released late 76. Then White Riot and other stuff. I bought pretty much every punk single for a year.
Looking back, it is hard to distinguish what makes them 'punk' now. The first Clash and Damned LPs ticked a certain box and are, in my view, originals. By contrast NMTB, enjoyable as it is thanks to Steve Jones, sounds like straightforward rock to my ears these days. The Banshees were probably the most unique and distinctive of the bands, especially when John and Kenny were in the line up. The guitar sound was so brilliant and original that John McGeoch pretty much pinched it when he became the Banshees' guitarist. But they are very much a thing of their own that transcended punk.
I would now class 'classical' punk, which means things like: outside view (Eater) emergency (999), right to work (Chelsea), incendiary device (Johnny Moped) development corporation (The Now) etc as the one aspect of punk that does not fare well over the years.