Hey. No need to get all uptight. GSX-R's are marketed towards motorcyclists who want the maximum amount of performance. To do this, concessions have to be made. So what if the thing can't do 100000 km without major rebuilds. And if the thing breaks within the first couple of years, it might be a pain in the arse but warranty will cover it. If you want something to last, buy something that isn't in such a high state of tune, like a bandit. That's the nature of mechanical components. You can have performance or reliability, but not both.
As for where did the weight go and power come from, I'd be interested in that as well. Not because I want to get to the bottom of some great conspiracy, but because I'm just interested in how manufacturers increase performance.