[shmerl]

Lack of known good reasons, and their major infamy in perpetuating lock-in in general. They have only themselves to blame for being seen in negative light in this topic by default.

[agmcleod]

That doesn't mean their isn't good reason. I guess they believe they can build a better product by having control over the graphics pipeline. Obviously I cannot say for sure what they think in that regard, but neither can you.

[shmerl]

Not very convincing. They often used excuses of good reasons to do sinister stuff, so, they'd need to work much harder to fix their ruined reputation.