Too bad snakes aren't like cats...I think they'd love all this admiration from us, lol.
It's not a "definite must" to skip feeding when a snake is in shed, but it does help to keep from over-feeding a boa that has a slower metabolism to begin with.
Some snakes of all kinds accept food in shed while others don't...it's very individual, but also some have no trouble digesting & shedding simultaneously, while for others
it makes for messed up sheds because both digestion and shedding requires good hydration from their bodies & some snakes don't multi-task well.