If you look at my 2nd pic. I had the intake and return on the left wall of the tank. The setup is heavily planted with that big mass in the middle. Even if I increased flow I don't think it would move the waste around from the right side. I get what your saying, but in a planted tank much more is processed in the tank as opposed to an tank with a Jack Demsey in it and no plants.
Getting back to ADA. It's true in the gallery they have a staff cleaning their tanks, etc. It is living art. But there are countless tanks that only use ADA products and it works. ADA does not sell powerheads (last I checked) nor do they sell reactors. The use in-tank glass diffusers and the plants somehow get co2 and other nutrients. It's not smoke and mirrors. ADA does sell something called a Pro Picker that removes tuffs of BBA from rocks and wood, so they do know people will get algae, but no powerheads, no reactors.