It seems to me that there are lots of types of cages for assorted small animals and birds that have some sort of removable bottom, tray, bin, etc, for making cleaning easier. But reptile enclosures (not really talking about bins and tubs) don't work that way. Whether it's a tank or one of those things with sliding doors on the front or whatever, you have one large and difficult to move/pick up/dump item and you have to clean it by getting your arms into a narrow opening and scooping everything out.

Obviously you wouldn't house a snake on wire mesh with a tray underneath like a birdcage, but it seems like it shouldn't be hard to create a snake-safe enclosure with a bottom consisting of a tray deep enough to contain the substrate, so that you could just slide the whole thing out to clean it. If everything fits together snugly, the snake shouldn't be able to squeeze around the edges of the bottom tray. I guess I'm picturing something like a vision cage with a tray or bin a few inches deep that would fit it exactly. To clean, you'd take out all the furnishings and then you could slide out the tray and dump it straight into a garbage bag. The tray would then be easy to hose off, dry off, disinfect, whatever. Much easier than scooping everything out of the bottom of a tank or the back corners of an enclosure mounted on a stand that you can't really move around very easily.

I'm getting a new (baby) ball python soon, and initially it will be housed in an old 20-gal tank I already have. But my goal is to eventually build an enclosure like I'm describing. The bottom will be made out of/lined with a plastic bin of the Sterilite store-stuff-under-the-bed size, give or take, with an enclosure built around it to the exact dimensions of the outer edges of the plastic bin. I think an UTH could be attached to the bottom of the enclosure so the bin would sit on it and make contact securely, without having to attach it to the bin itself. You might still have to clean in and around where the bin sits, especially if the animal manages to get poop into the cracks or if you ever had to treat mites or something. But for general cleaning, it would be very convenient.

So why aren't enclosures made this way? It seems like it would be relatively simple to design one around a system like that - if cost is the issue, it could be done so that the bin is optional. Or it could be designed around a Rubbermaid or Sterilite bin that already exists. But if I were spending a couple hundred bucks on an enclosure, I'd happily spend $50 more on one that was easier to clean.