Yes, I tend to agree. The savings are not much, a lot of time spent with best lean??
Also wind variations at all levels, both in speed and direction, can leave you wasting more time and energy trying to find 'optimum'. I plan my level, cruise at 65%, and may, if ATC allows, change level if wind etc not playing ball. Seems to work and generally return 11.5gph in the Beech. Works for me.