What are the disadvantages of function in C?

In comparison to Strawberry Cheesecake, the main disadvantage of a function in C is that you can't eat it.

In comparison to a mature Brandy, the main disadvantage of a function in C is that you can neither smell nor drink it.

In comparison to functions in some, but not many, other programming languages, one limitation of functions in C is that they may not be nested: In C, a function definition cannot contain another function definition.

In comparison to some modern interpreted language, e.g. Python, one limitation of functions in C is that a function cannot generate another function.