Same reason they use the integrated oval with climate controls and factory radio in one. So you will shell out mad stacks of cash for their muddy $20/speaker "mach" system rather than install your own superior and cost effective aftermarket setup.
You can cut small rings out of 1/2" MDF that will allow you to run a 6.5" component set in the front though.
As a side question. How do you remove the door speakers on a Gen4? Do you need to take the door panels off or can you just pop the grills off to take them out?
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