I somewhat agree; smaller trout will not take minnows as aggressively as LMB, Y Perch, HSB and other warm water fish.
With that said, I have to say that we do stock fathead minnows in our trout pond. I also believe that trout can and will get bigger faster by eating MEAT. That includes minnows and artificial pellet feed.

Case in point: Place a fathead minnow on a hook (barbless of course) and see just how long you can go without a bite in a properly stocked trout pond. ;\) They do eat fatheads!

Ed