Black, white, gray, beige, etc. Meh, it's all been done before. I have stuff to fit every category. As has been said, it's the usability that matters. After all, we use instruments, not gaze at their design theme.
Touch screens are good in that they can provide interfaces that are optimized for what needs to get done at any moment in time. However, they also get covered in schmutz and then don't respond reliably, especially for drag/pinch/slide/draw operations. I have mixed feelings (no pun intended at the time) about touch screens and still prefer physical controls (which could be accompanied by dynamic labels!).