With the exception of melting plastics I am in agreement the more times those knives are hitting the wood the finer the finish will be. Yet it will increase heat, and heat more than anything dulls sharp edges, so it may come with a price.
A comparison is a DeWalt 735 planer, which has a 2 speed gearbox, on a squirrel motor. The manufacturer says this about it. The two-speed gearbox allows the tool to deliver two speeds, 96 or 179 cuts per inch. You will use the 69 speed for creating dimension in the material while using the 179 speed for fine finishes. A lot of stationary 220 planers also have a 2 speed gearbox. I know I never change speeds on mine, and I've never known anyone who does on their planer. I'm just set on the faster speed. I do change depth of cut pretty frequently though, so maybe I do change speed, or workload, and never thought of it as such?