Lets see.
To be realistic, the game would have to somehow allow for the athletic ability, good or bad, of each player.
No more playing at night on those courses that don't have night lighting.
A real variable WGT's game doesn't include is air temperature and humidity.
In short, WGT doesn't have a desire to make their game 'real', they just want it to make their approach real as closely as the limitations of graphics and programming available for use on the Internet allow.