Thats the motto for my 180 sump-K.I.S.S. I have one reactor for media going and a skimmer but that's it. I would like to expand on a good point Peter said - A refugium will only get better as time passes. Sponges and macro grow, absorbing nutrients. Dsb start denitrification and the pod populations start to grow/stabilize. I'm going to try a dsb on the new tank for the first time so we will see how I like it.
Ps I'm a big believer in phosban though az it has helped to control many nuisance altars in my tank.