When it comes to function keys, you either use them lots or rarely and for the former, yes - a physical key is prefered by far. However I see the advantages in other situations with the touchbar, however it would be great if the users had a choice. How hard would it be to have the touchbar in a modular design form that was user changeable and they could fit a row of keys instead?
However, there is always the option of an external keyboard. But then you end up carrying even more peripherals that you end up with a really thin light laptop and a second bag with all the adapters to enable to you to use the laptop in the way you want. For some it does feel like you got sold an electric sports car, yet end up having to tow a caravan about to carry all the spare batteries and other accessories you had in your previous car.
But certainly an opportunity to embrace modular design and allow the end user to customize in a way that has benefits and would win over pundits.
EDIT [spelling and fat finger W's]