Interesting comments Exonian and pretty much echo my own views.
I've rattled on about this before but there are flaws in the usability of AID - fuel gauge being my favourite bugbear but at least in the MKVII, you can upgrade to Car Play which does make a difference. With Porsche, you're stuffed with a relic of a head unit with no upgrade potential from PCM3 to PCM4.
Damping comments are interesting and I don't know if the CSS has the same spring rates as the CS (I've never bothered to find out) but I know that I can't use the CSS outside of comfort on most UK roads. It's harsh and the ride feels brittle. The TCR by contrast (also on 19s) has a lot more pliancy across the DCC settings. I drive both on B-roads a lot and the TCR is very civilised, even in the most extreme DCC setting (sport).
I would have put 18" wheels on the TCR but have a hatred for diamond cut wheels. Even though I never curbed them, I ended up with white worm so don't get the manufacturer obsession. Anyway, I have bought 2 sets of Oz Racing Leggera HLT in gloss black, they're 18" and I'm swapping them in as winter wheels on the TCR and CSS. A bit of extra tyre wall forgiveness for those puddles that turn out to be potholes. I'm also taking the CSS in for full geo. The toe is clearly out on one of the tyres based on wear so it'll be interesting to see how all these changes contribute to handling independently and comparatively on the two cars. If anyone is interested, happy to share what I find.