I'm not saying you couldn't or shouldn't use roller cranks, roller camshafts, roller whatever. Kawasaki's first big four stroke, the 900cc Z-1, had a roller crank. I just don't think you gain anything much, for all the trouble and expense.
As far as aircraft engines, I suppose you can find examples of anything, but I know that the WW2 engines used soft plain, short-life bearings of high "imbedability," meaning that they would break in fast and could survive a certain amount of particles in the oil, from battle-damage or whatever.
Particulate matter is deadly for rolling element bearings. Go down to your local machine shop and look at the plain bearings they have pulled from car engines; I think you see why an ability to survive particles and scratching is a good quality to have in automotive bearings.