No strategy is better than the other one, it is only a matter of quality of shots produced, yes a symetrical game is less prone to open the court for your opponant, but if you have an great inside out forehand, good enough to make many winners or to expect only a weak reply from your opponant, then go for it!
Federer and Kuerten are admired for their backhands, but just take a look at how often they run around their backhand to hit a forehand.
For Grosjean, a more symetrical game means less inside out forehands, more backhands and a higher % of forehands hitted crosscourts, given the excellence of his inside out and down the line forehand when he runs around his backhand, given the lesser quality of his crosscout forehand, and given his often suspect backhand (even if he has improved it compared to the beginning of his career), the right strategy for him is still to run around his backhand as soon as possible and go for the killer forehand that he can hit inside out or down the line with great success.