Completely agree with this. In a live environment (loud, dark, time sensitive) I've found using a iPad to control music much harder than using a standard computer keyboard, even with the iPad's simple controls.
How are dark environments a big problem if you can see the buttons? Touch panel based mixing UIs are not unusual in said spaces; I've seen people using touchscreens instead of physical sliders. Given that, this device would be perfectly usable in a dark mixing studio or similarly poorly lit environment; no less usable than a traditional touchscreen (probably more useful, since they can carve little notches into the buttons so you can feel where they are).
It just doesn't make sense to criticize the lack of tactile feedback when a device like this provides more tactile feedback than traditional touchscreens. That criticism only makes sense if you view it as a replacement for a hardware mixing board, which it obviously isn't.
A brightly lit screen and hand-eye coordination are not 'compromises' unless your goal is to build a device that is all things to everyone. There are non-tablet devices with highly tactile physical input, and there are also these mysterious inventions called 'light bulbs'.
Thing A requires some things to do X. Thing B doesn't require these things to do X. One is a superset of the other, therefore one is clearly better, no matter what the semantics.
Thing A requires gasoline and a starter motor to get you to places. Thing B doesn't require gasoline or a starter motor to get you to places. One is a superset of the other, therefore a bicycle is better than a car no matter what the semantics.
Are you serious?
The point is that tablet computers get used in different scenarios from desktop PCs and in different scenarios from physical mixing boards. Pick a device designed for your scenario, then complain if it's not fit for purpose. You're not going to have a mixing board on the train with you and you're not going to use a tablet to do a live mix at a dimly lit concert.
Yeah, operating hardware without any tactile feedback in very dark environments sure sounds nice.