Like when with the C64 no one uses the "Expansion Slot" or the Rastport or the PCMIA-Card Slots for the Amiga. The only successfull 'flap thing' was the MIDI on the Ataris.
According to market share statistics, less than 1% of computer users have a MacBook Pro.
Which would make it even less of a big deal, applying to less than .01% of computer users.