I think it's because lenovo really isn't a brand you buy for gaming. Sure they have a gaming lineup, but they are more business and production oriented, and the Quadro cards back that. The Quadro cards aren't bad for gaming per say, you can still do quite a bit with them. I have a P51 mobile workstation with what I think is NVIDIA Quadro M2200 4GB GDDR5, and it lets me play anything I've tried so far without issues. Granted the CPU and GPU get extremely hot on these things if you so much as think about loading up a game. My internal temps are constantly between 80-90 degrees.
Also, gaming rigs and mobile workstations have differences in how the hardware functions. I don't have an intimate explanation, but gaming laptops are not meant for virtualization. If you have a gaming rig and mobile workstation with the exact same specs, the workstation will host VMs smoothly while the gaming laptop VMs will be slow and clunky.