How many REAL GT race cars use belt driven 4wd drivetrains, Lexan bodies, dish wheels or electric motors and batteries out of a power drill?

It's RCGT. It's scale racing, and with that comes concessions for the better of scale racing. There are things done to make them appear more real (driver figures, spoked wheels, racing liveries, etc.), and things done to force racers to not use items that are made specifically for racing, like treaded tires instead of pre-mounted race slicks.

It's old school scale R/C racing. Deal with it and quit complaining.