I will tell you that I once "kinda" thought like that (little water changes). I believed that since I added everything that was depleted, and my skimmer sucked everything out, I was fine. and actually, it was fine. I also found enough big names to validate my thought pattern.
However, after more careful research, I realized that a skimmer only touches about 30-40% of the proteins in a tank, that trace elements other than mag, alk, calcium need to be replaced, and that the % of ions to each other can get all fubbed up. I also noticed that by doing 20-25% water changes every 2 weeks, my tank is thriving instead of "fine". I guess it just resets all parems by enough to keep things constant month after month.................IMHO.
every 2 weeks, 20-25%, RO/DI best, however, tap water works..........