FFS, they didn't remove the F-keys, you can still have F-keys if you want...and they made all the ports do everything. They removed the card reader. Whiny posts by people who didn't even pay attention are more annoying than Apple.
For those who need it, Esc will be readily-mappable to a hardware key combo.
Also, it's simply false that you can't use a Touch Bar key without looking down. It's just a simple motor skill like anything else. Very very slightly harder than having a hardware Esc key. Trivial.
Also - external keyboards are still possible!
I'm hopeful that the customization of TouchBar will have some perks that weren't quite made loud & clear in the preso.