I think that's what this hobby boils down to.. picking your battles. Everyone has their own unique goals and with them challenges to overcome or to achieve in reaching those goals. As suggested, some people are perfectly happy with a salt water tank with a few fish and low maintenance, while some people NEED to have to have that cool fish, and that cool fish, and oh, that one too! Need to have those LPS corals too, and SPS' that are thriving as well! Somewhere in between having just an empty tank with saltwater in it and a tank full (possibly overstocked) with fish and corals, the hobbyist has had to decide where the line is drawn and which battles to fight. Do I keep all those cool fish and risk them fighting one another, eating my corals, nuking my tank, do I deal with the high nutrients, dose to keep nutrients low? stock less? more live rock, less live rock, deeper sand bed, skimmer, no skimmer, bigger tank, smaller tank, more flow less flow?
For me personally I am trying to find a balance where I can keep all my cool fish and corals, while at a cost (time and monetary) in maintenance. The battle I have chosen to fight (today at least) is how to achieve this with all the various methods of nutrient exporting. Frequent water changes just happens to be one that I was curious about.