I use the grate for only safety reasons. My guys haven't explored the bottom "yet".
So there is no paper shredding or poopy feet to worry about "yet".
Im afraid if I take the grate out , the slide out bottom can accidentally slide out and that would mean something can get in/out . My dogs surf the surrounding area for pellets and food items tossed out. They have learned if they slide the bottom catch tray out just a
little , any pellets sitting on the edge of it will fall out .
The dogs now have their own PEZ DISPENSER ! I have put a stop to it though

But that's why I use the grating , but I am able to put the paper over the grate that makes cleaning it much easier .
I would like to remove the grate from the parakeet cage , but the same applies and I end up with a large gap that they can easily fit through , but I can put paper on top of it and they don't mess with it too much . I also put a couple of layers so I can remove a layer and have a new one right underneath, lolol. I strive to make cleaning easy and fast.
But when sanitizing , that means EVERYTHING.

I feel the grates can add protection as well as sanitary needs.