> If you are going to use the display to show the UI, you may as well just use touch interface This is just absolutely not true in practice. Many synthesizer

> If you are going to use the display to show the UI, you may as well just use touch interface This is just absolutely not true in practice. Many synthesizers have the described design where you have a set row of knobs or buttons and what those controls do changes based on the current mode or state. A screen tells you the current function of each control. It is much easier to build up muscle memory that lets you grab the right control and do what you want than it would be if you had to interact with the screen itself. The difference is so stark that it's hard to even explain if you haven't experienced it first-hand. And this is for musical instruments used in live performance, often in the dark, where muscle memory and interacting instantly and correctly is vital.