Mixing oil is definitely a minority opinion. Oil companies do it all of the time to make a semisynthetic, but they prefer to overcharge you for their mix rather than have you experiment with your own mix, and maybe blame them for any bad results.
I agree with Mark Lawrence at his Calsci motorcycle site (a quote is below), after my own testing for shift and clutch feel and oil longevity. Note that I change my unusual mix at least every 3500 miles even though it is a semisynthetic:
"I'm sometimes asked if it's ok to blend your own oils. Yes, it is. Oils are all made out of pretty much the same chemicals, and nothing really bad will happen. If I wanted to blend my own oil, I expect I would use something like 25% Motul 5100 10W-40 and 75% Chevron Delo 15w-40, which would get me both the advantages of a lot of diester stock (5100 is pure diester [I think he meant 7100]) and the diesel additive package. In the winter, however, I would use 25% Motul and 75% Rotella synthetic, to get the superior low temperature performance. In fact, I just run Rotella synthetic in everything I own, year round: ST1300, DL650, Superhawk, Chevy Silverado, motorhome."
Larry constantly attacks any idea he does not agree with.
"We have created a Star Wars civilization, with Stone Age emotions, medieval institutions, and godlike technology. We thrash about. We are terribly confused by the mere fact of our existence, and a danger to ourselves and to the rest of life.”
― from Edward O. Wilson, The Social Conquest of Earth.