Not arguing with you here, am genuinely curious. I am looking at Boxster S's and going for PDK would certainly allow me many more options, why do you prefer auto?
You need to ask yourself is the car a daily user or a weekend toy?
I love a manual but at the same time I am not afraid to admit there are automatic options that are just as involving and even more fun. A car as a weekend toy only, a manual would not put me off as a manual gives you extra freedom that some automatic boxes do not.
But as a daily user well to be honest I find clutch pedal annoying, of course pressing a clutch pedal is what makes you a man in some peoples minds, but the reality is its just an annoyance, particular in traffic and as such for a daily an automatic is better.
Then lets remember automatics have come on miles to the point they are now also faster than manuals and the good ones when in manual mode are great fun and involving.
If I was buying a Porsche like you I'd not be looking at manuals, if Porsche offered the GT4 with PDK I'd go buy one tomorrow as I love that car, its nearly my perfect car, except the fact its a manual and I'd like it to have a few more horses but its light so its not exactly slow.
On a Porsche as long as you get PDK with sports plus and the sports wheel with paddles its an absolute riot and I'd take it over manual everytime, even if it was just a weekend car.
Porsche and BMW make it easy to go automatic because they are truly fantastic, Porsche PDK and BMW's M-DCT are marvellous and the people who generally put automatics down never driven one for more than 15 minutes, the people who own them generally would never look back. Audi's S-Tronic as on the R8 is also very good too, but my favourite is BMW's M-DCT with its 6-speed ferocity selector on the gearbox independent of any other car settings.
I am taking the gamble by picking 10-speed on new Mustang, I disliked the 6-speed auto in current gen, not so responsive on paddles and no blips. Hoping the 10-speed is better!