You will find that almost all aspects of orchid culture are peppered with differences of opinion, and feeding is one of the hotbeds.
I prefer to take tips from nature, where the available nutrition level is very low, but almost constantly available, so I feed at every watering, at very low concentration - no more than 50 ppm N (divide 4 by the %N on the fertilizer label; the result is teaspoons per gallon to use for that concentration). Low feeding rates also avoids overdosing nitrogen, which can quash blooming.
I am also becoming a believer in what has been dubbed "K-Lite" formulas - a feeding regimen using fertilizers low in both P & K. I am one of about 75-100 folks around the world testing the concept, and it is apparent that the plants appear to be healthier, long-term. I understand that there will be an article about it in the AOS Orchids magazine in March.