KMM:
Re Rear Wiper:
If you drive your car year round, it is very useful. For example, when you're backing out of a parking spot, when it's been raining. Or if you're in stop and go traffic and it's snowing. Any time you're not moving at a good clip...
Aside from the actual benefits, the rear wiper in my opinion gives Porsches a functional look that sets them apart from , in my mind, always separated Porsches form other sports car companies. I have to say however that the new rear wipers don't hold a candle to the older ones (original 911 wiper with the kink in the arm, or the amazing 928 rear wiper...)
I do have a rear wiper on my current Carrera S 997.1 and find it useful in some circumstances.
However, I've chosen not to include one on my new Carrera GTS. I feel that 'visual outweighs practical' on this car. My feelings would be the same with a 991.
I will have a rubber 'scraper' in the boot though..
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"Things turn out best for people who make the best of the way things turn out."