Uhm, no. Not many thousands. But stuff like FLASH, which is on virtually every computer on Earth, yeah, it should be tested.
If Apple was serious about Flash running well on Macs, it would have done it. Come on, the new Flash 10 beta runs nicely on Android, but it chokes a 27" iMac?! And this is not Apple problem?!
Notice that Apple has gone out of it's way to prevent Flash on the iPhone, making it the only major mobile platform which will not be able to run Flash 10.
I like Apple, but for some here it's like religion. No matter what the evidence against their deity, the faithful will defend it to the death.