^ I would have been happy with any of the Tyres you mentioned apart from Bridgestones - I went for PSS on replacement as they were as cheap in Costco as Conti 5 etc are elsewhere. Plenty of GTD/GTI owners from launch models here (there was an assortment of tyres going on 2013 built cars) that didn't get Bridgestones and didn't really suffer from tramping. My point is not that PSS should have been fitted, but that pretty much any other tyre in that retail price bracket would have done a far better job of giving grip and traction.
Some recent Golfs on 19" wheels have come on Contisport 5.
My Dad's GTD came on Dunlop SP01s and you couldn't get it to tramp at all, excepting icy conditions. 8 VWs from new (4 Golfs, 2 Sciroccos and 2 Polos) and 3 of them came on Bridgestones and the 2 that were 2WD tramped easily (all 3 had poor damp grip, dry grip on a par with a mid-range brand), the others came on Pirelli P7s, Goodyear Eagle, Dunlop SP01, Continental etc and didn't tramp.
Are Bridgestones markedly cheaper than their peers at a bulk level? It might be as much down to reliability of delivery in those numbers as raw cost - we'll never know.
Everyone within VAG is at it, Audis can come on Hankooks now (the wife's A1 did, and i've seen a new S3 at the Audi garage on them too).
I fully agree with your paint comment - the paintwork appears half the thickness it was in the solvent based paint days when you look at your chips and how deep they are before you're into the primer or even the metal, with a lack of gloss lacquer anywhere that is considered out of sight.