Right, they only re-invent wheels when they feel they can make a better one. I don't think they feel they can go through the effort of fabricating a better chip. Though I wouldn't put it past rtm to try.
The philosophy "Don't reinvent the wheel" however, is definitely inconsistent with their philosophy. They will reinvent the wheel whenever they feel they can make a better one. Just because they haven't reinvented every wheel does not mean "don't reinvent the wheel" applies to this group.
They chose to create the best solution they think they can. They don't seem to care whether or not that involves reinventing wheels. The original argument that they should seems pretty silly.