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It's rather odd that if Apple thinks the touch bar is such a good idea, why is there no standalone Apple keyboard with the touch bar? Many users plugin their MBP to external monitors and keyboards at home or work. If you get used to the touch bar, when you use external keyboards you'll have to adapt to the physical function keys again, and back and forth...

If by "many" you mean about 1%, the answer is, there's not enough people that are looking to buy something like that to make it worthwhile to engineer it and produce it.
 
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