Problem with the skeumorphic design is that it's only approachable by people who are already familiar with the hardware, as dperfect already said. I share their frustration with such interfaces.
Also, non-skeumorphic doesn't have to maximize flexibility. It could just as well be designed for ease-of-use.
On one end is the skeumorphic approach with interfaces that directly resemble audio hardware. At the other end is total flexibility only achieved using path markers / bands. Product designers often choose one of these extremes to maximize approachability or flexibility.