>That's why noone complains that those surface products are locked down, it's because microsoft manufactures them

The Surface Pro is not locked down. You can even remove Microsoft's key and stop Windows from booting and install Ubuntu's key or your own.

>Consumer harm comes into play when microsoft leverages their existing desktop OS monopoly to twist OEMs' arms into including an encryption key that OEMs gain no direct benefit from.

The OEMs benefit is that their customer's PCs are not vulnerable to undetectable rootkits as soon as they get on the internet and get hit by a Java, Flash exploit or download a fake codec or toolbar. Interesting how no one seems to talk about benefits of secure boot to real users in this discussion.