I agree. Not based on any official study, but just my experience of many years living with & knowing so many snakes. And seeing that they remember & trust me, even when not handled often, & that trust carries over to others when I've shared them, even at the vet's office. None of my snakes have ever bit anyone else once tame with me- I'm not calling it love- more like trust- feeling safe. And it makes sense to me- in the wild, they learn their way around & learn where they are safe from predators- when they're captive pets, we're part of their environment that they learn to trust. If things change around them, they're instinctively unsettled until they learn they're still safe.
I do remember reading that snakes that are rehomed are more likely to get sick- ie. their immune system responds to stress much as ours does- stress negatively affects health. That's why anytime I get a new snake, I try to treat them like a newborn in the ICU- lots of "TLC" while they settle in, & hands off for a while. New snakes- whether shipped from a breeder or from a store or an expo- have often been thru a LOT & exposed to other diseases along the way- so you want them to remain healthy & have their immune system work as well as possible.