I see a conspiracy... Hardware manufactuers want to change more and give less.. under the guise of so-called market trends.
Here are a few examples
[MAC] ... [Remove Floppy Drive] ... [Remove SuperDrive] -- charge the same
[PC] ... [Remove Optical Drive] ... Call it a Netbook -- charge a premium
Remove keyboard.. mouse.. call it a bloody tablet..
I agree with many on here. Desktops have the RAW power that other systems lack. This is definitely the case when it comes to CPU power and hard/optical drive speed!