You've failed to mention what those are. It seems to me to be the case that "these outliers" are in fact the rule. As a rendering engineer, I have lots of doub

You've failed to mention what those are. It seems to me to be the case that "these outliers" are in fact the rule. As a rendering engineer, I have lots of doubt that those vendors will move away from their proprietary APIs, they provide significant advantages, and from anecdotes from around the industry, I think this state is preferred by engineers in AAA development, which I think is where much of the forces in the industry come from.