elder norm (That was so funny. Let me try rewording it slightly. LOL)

The car thing does not work because the principles of a gas engine does not change. Now the PC hardware does. There are compaqs out there right now running XP, that if i were to try and load the retail version of XP on it i would fail. You need to get the XP from compaq. How various pc makers implement there hard ware can change drastically. They have bios allocate a non standard memory range for add on cards.

Realistically the PC has way more possible combinations then the mac does . Not every scenario can be played out. for testing in addition to PC maker doing screwy things you have to worry about add on cards not playing fair with each other. You don't have people building thier on macs, that eliminates alot of incompatibles