Why Can't PC Makers make a great laptop Trackpad?

Another Day, Another Apple inspired design from a PC manufacturer that again fails miserably at copying the best part fo the Macbook Pro.... The Glass Trackpad.

I am referring to the Envy 15 review which is clearly a Macbook Pro wanna be and while the review is mostly good, the trackpad is again another failure for HP (and every other PC OEM making Apple like Products).

So why is that no one can touch the Macbook Pro's Trackpad? I was looking at the Envy 15 for my brother as a going away present but because of the failed trackpad. I am going with a Macbook Pro instead, with Win7 /OS X combo.

Just want to hear your thoughts on why PC OEM's can't nail this?