Well, when sippy cups that get hurled or flung, the valve can pop out. Then they leak. I have never had a soda just sit and wait to be soaked up with a napkin - that is amazing! My husband had a can of Coke left by accident in his car while at work....in the summer in Phoenix. The explosion was not pretty. You see, with fabrics and carpet, stains get down deep and you think they have come clean. Until they work their way to the top again. This is called "wicking". We are still spot treating soda stains in his car from 3 years ago. You think that it is finally clean. It has been steam extraction cleaned 3 times. But, darks spots still work their way to the surface again. I have no idea what my kids to do the back seat of my Accord but it takes a beating. I would rather use a Mr. clean Magic eraser and leather conditioner than keep re-scrubbing the same old stains in the seats. I am done. Give me leather. I don't wear short shorts or skirts so I don't need to worry about hot seats on my legs. It is not cold here ever so I don't need to worry about cold seats. There are easy solutions to protect the leather from car seats. I have never been in a family vehicle with leather that has that weird kiddo smell...like it has absorbed cracker crumbs and drips of milk and playdoh from preschool.
Good thing there are choices, right, and we can choose what works best for us!