I see your point, and agree with it in most cases. But I've only been reefing about 10 years. I can make a case on both sides of this discussion based on observations of my own tank. I can see both sides. I had a packed refugium, for years, but that didn't stop there carpet of gha in the display. I fiddled with flow, maintenance practices etc to no avail. , by about year 3 I realized that if I leave the gha on back glass and only cleaned rocks/ sand, it would mainly grow there. Eventually I pulled handfuls off the glass and put it in the refugium and it stopped growing on the glass also. I think/ thought the same thing, that giving it a place stops it elsewhere. And it does seem that way still. On the other hand, after years of a clean display, I had to remove a couple rocks(to remove a overgrown coral) ; this exposed clean white rock to light... guess what happened..(?) All the uglies showed up,one after the next(gha,cyano, dino) on that bare rock. I did nothing about it and it went away in a few months. Why? If the refugium fixed it to begin with, why did it show up? Why did it go away without any changes? I'm no scientist, so my best understanding of what is happening is going to come from those who are scientists, those who are much more experienced than me- who are have nothing to gain from me, nothing to sell; those who just try to share the knowledge. Call it lazy, I call it smart to not ignore these select few. I have nothing against ats, it is a powerful tool. It is not a new idea, but if it is THE solution, why do algea problems still exist?