In reply to:

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Trust me it isn't. But then, an inferior product that has actually been taken to market has the advantage over a much better product that has been left to rot on the shelf for two years. If anyone gets the bright idea of dealing with the automotive industry, take my advice and don't bother.

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What would be a better interface? I'm not very creative.

I believe these are the limitations (at least for VW/Audi integration):

Only display is CD 1-6 and track 1-99.
Only control buttons are forward/back for track, disc, and scan plus a 3 state randomize control and "scan" button.