Esc key? I assume you have used that since 1990.
Function keys control fundemental functions of your laptop , hence the name, such as screen brightness , volume etc...they are not there for apps.
The key of function keys is using them without looking at the keyboard , where the TB fails from a usability point of view and passes from a gimmick point of view.
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feel free to write your own opinion and we can compare. I'm being honest, I see so many people here go into a frothing rage over negative reviews. So I ask them to do their own. Fact is , fan or not, this product has divided long term mac users so pretending it does not have some major issues is not very realistic. I own one.
Only an extreme level wally would think the escape key and function keys aren't on the Touch Bar. Not only are they there but you can configure it to be exactly the same as before.