That is a good point, Bill. I've thought about it in the past, but I still put the grease on the final drive side spline and not the wheel side. But, I guess that I'm not overdoing it as the final drive oil remains its normal color, and there is usually remnants of grease on the splines the next time I have the wheel off.
It is also important for folks to realize that the axle nut should be tightened to spec, and not just cranked on as hard/tight as one can make it go-that will cause too much bearing preload and premature failure (As well as possibly squeezing grease through the oil seal).