I think really only the evidence we have is the people who had trouble getting a new snake to eat, move it to a smaller enclosure, with the same hide, and then it eats. I wouldn't call that bupkis personally, however it is very unscientific and a conspiracy among pet shops is a little silly to me. Our hobby has been suggesting those 1 dollar tubs since before I got in. I think it benefits Target more than pet shops.
Way I see it is there is a cookie cutter way to give someone the best chance of success. Small enclosure, dual hide, ect. It's not that, that is the only way to keep a snake, it is just the general way to set someone up without knowing the animal and the new keeper not knowing much of anything. A small tub has been a good baseline for many keepers.
Once you learn what normal behavior is, you might start doing things to tailor to your snakes needs or your needs. Personally how I take care of my snakes breaks about half of what's in our care sheet and I'm pretty sure some people would treat me like one of those craigslist posts because they seem to think there is only one way to do things. I think most of us here however can agree there are multiple ways to have healthy happy snakes. While I completely agree with what your post is about, the hides in the enclosure matter more than the enclosure itself. I wouldn't completely dismiss the small enclosure all together. You can ask the 80% of my snakes that don't have a hide at all![]()