At some point you have to stop giving the benefit of the doubt. I draw the line where Google is unable to make a search page (that is making them the "x billion dollar" company in the first place) work with Firefox due to "lack of dev resources". Even though the only thing stopping the page from working in FF is a user agent check.

You are making exactly the same argument that Microsoft proponents were making when IE was bundled into Windows trying to push off other browsers. We don't have all the context, it must be too difficult to separate browser and OS code, etc