Vacation feeding issues concern fishkeepers who can't imagine a poikilothermic metabolism. The same mammal-centric thinking that insists a betta wants "some buddies."
Here's something about vacation starving that I'd like to know: the fatty deposits in our fishes' livers that come from the rich constant fare they're getting-- is a fish able to reabsorb these fat globules, if we give it a sufficient time with no fat and protein intake? In starve-season in the tropics, don't fish reabsorb the fat that's been deposited around their organs during feast-season?
Fry and juveniles are a separate story, of course. Fish spawn at the beginning of the plenty season, just so that growing fry never have a "starve day."
It's hard to give them a "starve day." They get so quiet, biding their time, conserving their energy. We like to feed the fishies, because we want more action!