I was thinking about that too and it could be due to aerodynamics and range. I would guess that anything other than very subtle differences affected the range more than Porsche wanted.
Maybe decided that like some other manufacturers, it's not worth it, or even hurts sales, to significantly differentiate the appearance of the different trims?
Corvette has been doing it for a long time. Tesla too. Maybe, and I'm just speculating here, they end up selling many more lower end cars if they don't look much different from the high end. Porsche already sells more lower trims than the halo trims, so if keeping them looking similar loses 10% of halo sales but adds 10% to all other trims, it obviously translates into tons more sales. It may also help keep the lower trim resale values higher.
Horses for courses, I'm a fan of the stealth look myself, not more frippery. Given the most strangers see a car for longest is likely from the rear whilst in traffic then leaving the model designation on the rear is a pretty clear indicator if want to show it off (nothing wrong with that, as said all down to personal preference. For me I'd rather surprise someone if in the mood).
Different people buy cars for different reasons. Some buy the car to drive, some to impress others. A good test of which one you are would be asking yourself whether it would bother you if people could buy a lower trim/performance/functionality car than yours, but then make it look exactly like your car by adding some plastic badges for a couple of hundred dollars?
