There aren't many potential missuses of the proposed design. The synth is fairly self contained and will be pretty much plug-n-play like any other device in its product segment. All of its I/O is standardized and would simply not function if hooked up incorrectly rather than causing any damage. The user might accidentally clear any presets or lose a sound they created through misusing the GUI but that would not impede the function of the synth in anyway. Improperly updating the firmware or opening up the device are the only 2 areas where real damage to the synth can occur. Firmware updates will likely be the only way the synth would change over its useful life as those would contain bug fixes and new features if they are requested by users. I would hope that the synth would make its way onto the second hand market or be repaired once it reaches the end of its useful life for the end user, but if it is trashed, it should be treated as e-waste and be recycled.