Hi,
I think this is a very controversial topic. I don't really know the answer to this question.
I believe that the only downside for the snake to racks is the element of discovery. There's nothing in the tub but a water bowl, maybe a hide. The snakes are usually not stressed out because they are eating, but are you really making the snake happy?
I would want to purchase racks later, but I want my snakes to be happy and content.
What are your views on this?