The end goal is stability so once you finally get everything dialed in if uve succeded u really shouldn't have to religiously. Obviously though it's always better to be proactive then reactive so an occasional test or 2 to catch things before there a problem isn't a bad thing.
i only own a thermometer and a swingarm hydro for 15 yrs no other tests required on sm tanks
all you do is chg water 100% weekly and cheat, start with purple live rock and skip the cycle, lasts a long time if you keep up the wc work. if we want to slow down, some tests might help