mine do the same thing, and i have a bunch of btas so they alternate at night, they like to be out and about during the day i feel, instead of just chilling in an anemone 24/7
and i wouldn't say they're dumb gumbii, it's just normal habituation, when a certain behavior is repeated numerous times, they eventually will learn that it's no threat and not waste energy trying to avoid something that doesn't need avoiding. my clown fish are the same and they were afraid of me when i first put them in the tank, and they were tank bred, but now they're like dogs lol, following me around the tank waiting for food.