Like I said, to each their own
I see the need or practicality of racks/tubs. I know they work, and work well.

My point was just that cages, even larger ones, CAN work just as well. I simply love the display and if done right,
there is no negative effect on the snake. I've kept all mine in display cages (not glass tanks), and they were all great feeder, healthy,
tame as can be, and absolutely not shy, either.

I do not put "human emotions" on my reptiles, but I do enjoy providing at least a small "natural environment" and I like to look at it, too.
It does take up far more room, it costs more, it takes more effort, it might not be as practical, but it CAN be done right.

For some people that keep them as "pets" and don't worry about breeding, for people that only have a few snakes, it can be an option.

That said, I prefer to keep hatchlings in small tubs on papertowels, until they are well started. It makes it easier to get them started and keep an eye on everything.
I also kept my rescues in tubs, because they were nowhere near my own personal collection, and they were sometimes sick or non-feeders that needed a very quiet and specialized
habitat (higher heat, etc)

Only my own personal "pets" were on display.

My Angolan Python is in a 4 foot display cage from showcages.com
She was hard to get started on feeding regularly and until she did, she was in a tub. She is now in her cage, and would eat every other day if I let her ! She has hides in both warm and cool end, some branches and her waterbowl. She is doing fantastic.