Well, the S2000 is an Asian car made for an Asian market.....and statisticly Asians are much smaller stature then typical white Americans, both in height and width.
In fact, I believe reading that Honda actually widend the seats for the US cars even.
Don't know if I agree with you on this, but keep in mind that there are a lot more S2000's imported to the U.S. alone than all sales in the Asian market combined. Makes no sense, does it? I think the seats were made snug to tightly fit the driver to the car, like wearing a glove. One of Uehara's definition of a real sports car.
Aren't all cockpits of real race cars made with tightly-fitting seats?