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I believe the blades on 11 blade(Which is what the Garrett GTX turbos have) get in the way of each other. The blades are so tight that the air can't backfill before the next blade passes once the turbo is flowing a lot of air.

But garrets new G-series turbos run 9 blade on the small end and what looks like 13 blade at the top end and they flow a good amount of air for their size. 50 lbs/min out of a 48 mm/60mm compressor.

It depends on the size of the compressor. If you have a huge diameter then the blades will be spaced farther apart and the turbo will spin at a much lower RPM. They always target a compressor tip speed of 540 m/s, so a larger diameter wheel will reach that at a lower RPM.
 
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