I'll try to put it in some perspective by utilizing my own experience.
The 1992 Miata I just bought has A/C and it's probably the only thing I wish it didn't (it will probably come out soon). Every thing else about the car is so nice and simple. No power steering, crank windows, manual locks. When I toss it into a corner on crappy no-name tires, I can feel how light the car is. If it didn't have A/C I'd have one less belt, too!
Even with the little 1.6 liter engine, on a twisty back road, I feel like the car is never lacking for power, and has such poise and athleticism. I feel that if driven properly on my favorite twisty road near my house, this little car could keep up with my fully loaded '91 911 C4 all day long (so long as the road didn't straighten out!). The 1977 Carrera 3.0 that I had (no power steering, manual clutch, manual brakes, etc.) was a similar story. Even though it had probably 50hp less than my C4, it felt just as quick and certainly felt lighter. It's like I can feel the 15 years of bloat that got added. I know my C4 is faster and holds the road better, but it definitely feels heavier (and it is-for the record, I got it because it was a good deal, not because it is my ideal 911, I'm still looking for that).
It just makes me think that the original formula worked. This original formula launched the miata and made it an icon and the benchmark by which all others were measured. I feel like they've gotten away from it, as has every other performance oriented manufacturer. They've standardized features and added weight to appease the masses, but in the process they have lost touch/sight of what made them such a joy in the first place, the simplicity, ease of use, and driveability - without the need or want for abs, gps, psm, asm, awd, pw, pl, ps, ac, mfd, ipod, mp3, tpms . . .
I hope people don't think I'm being stubborn or pig-headded here (actually, I know you all well enough that you would just come out and say as much ) but we are the crowd that actually understands what "adding lightness" means - and I'm not saying it should be a mainstream offering or anything like that - actually I like the idea of an option-delete build spec. I'm just saying that when Porsche comes out with this "lightweight" Boxster, it shouldn't be a suprise or a big announcement, it should be grounds fees for the manufacturer to have such an offering.