Not a matter of support for one system or another so much as it is making sure that both sides are presented honestly. Often Mac proponents tout the stability of their systems over Windows, but the reality is that a properly configured and maintained Windows system is no less stable than Mac or Linux. They all have their uses, and some can do some things better than others - however in the realm of general purpose home computing nothing at all comes close to Windows. Attempts to make Linux more user friendly have resulted in a bloated GUI and reduced stability. Apple does not offer the freedom of hardware configurations or software that makes Windows so appealing. However when it comes to video editing, there is a lot (OK - 2 ) of Mac only software that makes life a lot easier - but as Adobe indicated with dropping support for Mac in Premiere Pro...Apple is loosing ground in that area.

Anywho - would an OpenGL interface be nice for 3DGS? Sure, I prefer working with OpenGL for rendering elements anyway. However I do not think that a new gravy train of Mac users and potential customers for games made with 3DGS exists. Maybe Blitz is thinking ahead, maybe they are attempting to secure some form of future...or maybe they lost a bet. Time will tell, but the numbers don't seem to support it in the long run (granted they have been holding strong at the 1-2% market share for some time now ).