I think it breaks down when that array has to interact with system libraries or the C stdlib in any way. A lot of C string functions have weird gotchas related

I think it breaks down when that array has to interact with system libraries or the C stdlib in any way. A lot of C string functions have weird gotchas related to terminators and sizes, and any IO you're doing will involve raw buffers being passed into or out of a system IO function that doesn't understand custom array types.