Okay, but most Scheme code doesn't use call/cc, and even when it does the vast majority of the continuations in use are also "abstract function call stacks." Y

Okay, but most Scheme code doesn't use call/cc, and even when it does the vast majority of the continuations in use are also "abstract function call stacks." You said it yourself- a stack is a useful tool for implementing these non-C-like languages. Its presence does not force you to "buy into the C model to some extent."