That has been my point this entire time. Just because the engineering behind keys and keyways says they don’t carry load, doesn’t mean (aftermarket) manufacturers don’t use them for it. When you run out of area (for friction or bolt locations) you have to do other things. And they do. 20 years ago I had a vortec V1 S trim supercharger on a 347 in a mustang. I kept tearing up keys and bolts on the balancer over 20psi. Didn’t matter how tight they were I’d get 10-15 passes out of it and the key would be rounded off and bolts would be damn near worn through. My brother worked for Saleen at the time and I went to talk to Steve Saleen and his “engine guy”. Both of them said pull the crank out of it and have it broached for another key or replace the crank with one that already has two. I did and never hurt it again. I sold the car and 8 years later it was still together.