Uwe, you are really trying to get a rise out of me aren't you.
Weren't The Clash arena rock too?
Nope; playing a few arena shows (in the age of arena shows) towards the end/pinnacle of your career does not make you arena rock. ... Just like how the KLF were "stadium house" without ever really playing a stadium (at least not before that genre was defined, and they had moved on).
The Damned as spoofy as Slade.
Again, nope. I don't recall Slade ever singing about topics even remotely as serious as LGBT issues, youth violence, and the cult of celebrity as a social disease. The Damned's spoofyness was limited to their wardrobe and even then, they did it better and with more taste and political statement than Slade ever cared about (see above re LGBT issues and cross-reference with Captain Sensible's drag). ... also a lot of sarcasm.
Didn't Television's Marquee Moon feature more harmonic guitar leads than an Allman Brothers and a Wishbone Ash album put together?
I doubt this is even possible ... and Marquee Moon is rather slim on the guitar overdubs - they just didn't have the budget for that much studio time. They were also using Jazzmasters vs Les Pauls - they just sound like that - more trebly, less low end beef and richer in harmonic content (see also Sonic Youth).
But it's all rock, so of course some things done by classic/prog bands would also be done by punks (not just the windmills). It's not that punk can't do anything classic rock did, more so that it had to do it different - more or over the top for example, as here - 2 guitars both playing lead and no rythmm/riffage (very unlike the Allmans and Wishbone; very blues rocky with melodic leads and synched instruments vs TV's quirky jazziness with dueling minimalist leads).