This is basically a repackaged "no true Scotsman" fallacy. We're talking about a laptop here. Most people that bought a laptop are using it because they need something portable and self-contained. On top of that, the Touch Bar isn't meant for "essential" functionality just like the F-keys were never meant for essential functionality. They were meant to be shortcuts for commonly used functions.

I use an external keyboard with the Touch Bar all the time. Pretending like you have to use one or the other is disingenuous.