A completely analogous circumstance has happened between Microsoft and Adobe. Adobe Reader was promised to have .doc compatibility, but due to Microsoft’s internal processes, locked out certain features in order to optimize .doc production for the competing XPS model. Dirty pool, and pulled the rug out from under Adobe. They launched a product without an advertised, fungible feature. No one was sued, everyone understood that when one company must work with another’s platform, inefficiencies can occur. No acrimony, just patches ensued. I would hope gamers would attain the same level of expectation for this sort of software too.