Part two.  The windage tray or other baffles installed in the oil pan
improve lubrication in two ways.  The first is to maintain contact between
the oil pickup and the oil by restraining the oil from moving to one side of
the pan under suitable acceleration.  The second is that it reduces foaming
induced by the motion of the pistons, rods and crankshaft during normal
operation.

Less air in the oil, the more it can absorb heat and move it to the outside
temperature through conduction to crankcase, oil cooler, oil pan, and other
relatively cool parts.

So why do most two strokes have roller or ball bearings in their
crankshaft/piston/rod assemblies?

pensioner