I would think that capitalism would also provide incentive for creating a better toilet experience. Better products often lead to increased demand, but the bottom line and customer turnover to play a big role in business decisions.

I'm only guessing here, but I think the full-length doors on the stalls in Japan, which I think is their best part, were developed to close off the hole-in-the-floor toilets. If those toilets had half-doors, everybody would see you doing your business. If I'm right, using the full-length doors on the newer toilets is just a practice that has been carried over out of habit and custom.