An OS that supports locking out the fellow in front of it has merit in an office environment where the company handles sensitive data and theft is a real concern. However, the ability to lock out the end user is inappropriate in an operating system used in the home.
I strongly disagree. A lot of people who use their computers for several things in their home do use them also for sensitive data, I personally greatly appreciate being able to lock out the other people in my home because I don't want them messing up my stuff. I'm currently working on a suite (music), and although I have backups, the majority of my data is on my hard drive, and I would be greatly p.o.'ed if anyone in my home got onto my computer and installed any old spyware/AOL software/ or other unstable crap on my machine because they didn't know any better, and in turn threatened the stability of my machine, or the integrity of what I am working on.
It's not always about theft, it's just as much about people getting on the internet and installing 15 different Instant messengers on your machine when you're not looking.
