So that the machines could only run Windows, and open source systems that put in the extra effort for OF on ia32? Apple would still have figured out how to make the original Mac Pro obsolete after however many software versions, and would probably still have implemented it wrong anyway.
At least as it stands, you can choose between Mac OS X, Windows, Solaris, Linux, BSD, bare-metal hypervisors, etc.
Citation needed. Microsoft specifically requires that OEMs allow secure boot to be turned off in UEFI, and never have I heard anywhere else that doing so will render Windows unable to boot.
Which insane bugs? In EFI, or in Linux? Or is it more of a driver issue with the newest generation of chipsets? I'd thought the Linux people were getting better at keeping up with Intel's new chipsets.