So, Granny Gwenwald needs her modest sized kitchen walls and ceiling repainted. Cabinets are stained Oak. Masterwork is hired to paint it. After all the general prep, he masks everything in preparation for airless spray. LOL.Pressure applied by a brush and roller is probably less than pressure applied by a gun.... So there goes that theory.
Best practice is brushing and rolling because there are skills required? That's a load of BS. it also takes practice and skill to spray properly. How could the best way of doing something be the "most difficult" or "most traditional"? That makes absolutely no sense at all. The best way of doing something should be based on getting the best results, not on some old fashioned thinking.