Most notably, they shrank the B-pillar, giving you visibility behind you

This one bugged me, because my two major complaints about my TT were precisely this, linked to the impression that I'd climbed into a post box every morning and was looking out of the slit.
It bugged me so much that I've been looking at every newish TT in the town, but eventually I gave in and went round to the dealership: Maybe my height (6' 3") doesn't help, but I couldn't perceive any improvement in rear vision.