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More of a luxury than a need.
I would rather see the 9th and 10th man get 8 - 11 mpg.
It can be done. Way back in the day, Ricky Pitino had some success with 10 or even 11 man rotations at UK. Of course, he had lots of future NBA players.
Also, Lon Kruger played 11 guys 10 mpg or more...