You're kidding, right?
I don't drive my car with my foot flat on the floor, but when I go up a hill it's good that there is enough power to do it without needing to get out and push the thing.
And I have System Explorer telling me that most of the time I run my computer around 15%-25% utilization, but every now-and-then the utilization spikes. Even now I have to wait for it to finish doing "whatever," so if I had a less-powerful machine, I would just have to wait longer.
How many of us have joked about "Waiting for the Windows Hourglass?" I waste plenty of time as it is, waiting for the computer to do what I asked; I don't need something with less capability to waste more time every day.
I know my employer is often frustrated by the amount of time employees spend "Waiting for Windows", and customers on the phone hate waiting too. A lesser system would only make the problem worse.