More stuff to configure, then cost. Switching to modal screen-based interfaces happens when there isn't enough room on the panel in question to supply a separa

More stuff to configure, then cost. Switching to modal screen-based interfaces happens when there isn't enough room on the panel in question to supply a separate physical control per thing that needs controlling. Once you've had to do that, though, every remaining knob is a cost that could be removed by adding a few lines of code to the interface software. A single touchscreen for everything is the natural endpoint of this process.