What do you do if you have a collection of CDs - like many people actually do?
Do you pay money to buy digital copies rather than being able to rip them yourself?
I would imagine that you would purchase an external optical drive that suits your needs. No?
My feeling is that a manufacturer would want to reduce the number of mechanical parts on their platform in order to increase reliability and longevity. When you think about it, what typically breaks on a PC/Mac? The Optical drive, the HDD, and the fans. Remove the optical drive. Replace the HDD with an SDD. Use low-power parts to reduce or eliminate the need for active cooling. The result is a completely silent and reliable platform.
In addition, interconnects (USB3 and TBolt) are now fast enough to make external peripherals work without much fuss.
Last note is that I have never really been impressed with Apple's superdrive, when compared to other manufacturers optical offerings.
F