rich twats with guitars that cost nearly the same amount as a good 2nd hand family car relentlessly crucifing the easier to play chord 'favourites' from the Beatles songbook

I have a great deal of sympathy for your aversion to people crucifying the favourites from the Beatles songbook and similar, but let's not get hijacked by inverted class snobbery. There may well be rich twats with expensive guitars who are extremely good performers and choose their material with care. I, for example have several expensive guitars. Rich I am not. Twat - well, that's up to those that know me.

It's obviously just as possible for the cream of the Beatles songbook to be performed by poor twats with crap guitars.