No, that approach is THE SAME OR MORE demanding.
"In that case, Windows 8 will then immediately remind the user upon the next login that he or she must save work and then restart within a 15 minute window."
When I sit down to use my computer, and I log in, I'm NOT restarting it right away.
My computer WILL obey ME. Not the other way around.
If I see a ticking bar telling me that the system is going to restart whether or not I like it, I'm going to go into Task Manager, and kill that defective process and its shutdown initiation.
I want high availability when I sit down to use a machine, just like much of the Internet works on. If I have a VNC session going, and the machine thinks that its updates are more important than that, that's not good. If I'm about to hit a 25 killstreak, and Windows thinks that my game isn't a "priority" application, and it restarts, that's still very bad. Or if I'm working on an engineering application and Windows doesn't think that it's a priority to let me save my work first, and I lose thousands of dollars on work on that project, I'm going to think twice about considering a Microsoft solution.
So you know what, Microsoft? Keep your Windows 8.
I'll take Server 2012 and install it on my main machine instead because that won't give me issues.