That was definitely the way people thought 25+ yrs ago. However with good vacuum, reds will produce quite well. We went from having no red maples tapped in our sugarbush to about 1/3 of our taps being red maple. We make plenty of great tasting maple syrup.
We do have a project starting next spring comparing sap yield, sugar content, timing of buddy flavor development, wounding, and syrup flavor. Dr. Abby is the PI on that project.