Not very likely, because even at 3,000 to 4,000 miles, the oil and additives are not degraded very much. Changing more often just wastes money. There are no such polymers. Whether it is a motorcycle oil or an automotive oil, all polymers are subject to some degradation in the transmission. If this bothers you alot, use a synthetic oil.
Synthetic oils require little or no polymer, so viscosity change is very small.
Cost of doing business is higher per quart of motorcycle oil. Large oil companies make so much more product that their profit margin per quart does not have to be so high. Some motorcycle oils may actually offer less protection than SJ automotive oils. That's a good one. Chances are, there is no evidence.