I tend to think of razors a bit like pocket knives. While a fixed blade knife is arguably better, folders are just way too practical.

A kami doesn't have any user advantages other than the simplicity aesthetics IMO, and then there is the need of having to have a way of storing it with a separate sheath, box, stand, or whatever, which kind of nullifies the simplicity aesthetic.

Just my thoughts. Do it how you feel it, you can always make another.