I don't know. This sounds to me like complaining that a "c" key is inferior because it only produces the letter "c".
Function keys are part of a computer keyboard and have been there for decades, so users were rightfully PISSED about the change. For Apple to swap them into a screen you had to look at was unbelievably arrogant and stupid.
And to do it in a PRO machine, even more so. Thus, backpedal they did.
Fairly sure the C key is far more consistent across computer applications than function keys are. But I do understand your overall point.
And Typewriters existed for decades before computers and did fine without function keys, and were used by thousands of PROfessional journalists, lawyers, doctors, etc for as many decades.
As someone who edits videos, photos, and even dabbles into programming the TouchBar is FAR more efficient than static function keys that can't change into a slider, control surface or otherwise. In the rare occasion I actually need a Function key, I simply turn that on in settings. I understand they aren't tactile keys, however we have been using touch surfaces (track pads, iPhones, iPads) for decades now and people can adapt.
All arguments aside, I feel the situation would have been less of a pain of Apple made it an option to have function keys, as well as Touch Bar at the point of launch. The dropped HDMI, SD card readers and other ports at the same time, making the 2016 MacBook Pro feel like a slap in the face to some (not all) professionals.
When are we getting Dynamic OLED keyboards? I would love that option too