That's true, but also when a car goes forced induction, it changes a lot of other internals inside the car (braided fuel lines or different oil cooling systems for example). If you start mixing FI and naturally aspirated discussions, people might advise incorrectly, or not read a post correctly and not realize someone has a turbo. FI and NA cars are completely different beasts, so we felt it was best to seperate them for that reason. And since there is far less FI cars, they don't have it broken down to specific models. For example on Subaru forums, a lot of the time they have different model specific forums for turbo'd cars, and a single catch-all forum for naturally aspirated cars, because there's probably more FI subarus than NA (on the enthusiast side anyway).
See what I'm saying? Hum... I'd like to hear some feedback from other people on this however.