I have some pretty jaded opinions about fixes-in-a-bottle over the decades, so take them for what they are worth...
Some people see improvement when they start to dose stuff. The telling sign is if they see degradation when they stop. Lots of the time, dosing stuff like this accompanies a heightened awareness to their tank in a phase of wanting to do better. Sometimes, it is the acts in totality from the newfound push to be better that show the benefits and not one specific thing. These folks often stop dosing and their corals are just as well off.
There are all kinds of threads about acropower, marine snow, etc. that follow this same pattern... love it, not sure and then stopped dosing and world keeps on spinning. There is a common theme in all of this - the more breath and depth of experience and the more that the hobbyist can tell no difference when adding most of these products. In any case, it seems to be pretty harmless so nothing is really hurt.