Sure there is. Apple says - "If you want a dGPU, you have to move up to the next rung in the ladder and pay more for a 15" MBP or iMac".I can get no dGPU on MBPs but there is no reason not to put one on a mini as a high end option...
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That's the only reason there has ever been. The second Apple could rip their purposely gimped dGPU out of the mini, they jumped at the chance.