Yes, I would care. Someone who didn't know might notice the sizeof() and note that it returns size_t, but not know what to do about it, and end up saying "screw it" and just using "%d", which is not portable, and the program might crash when compiled for a different system. It might even run on his sytem today, but not tomorow, or run in the debug image but fail in production. I've seen this and similar things happen many-a-time.
Pet peeve alert: sizeof is not a function. It's a unary operator.
The parenthesis you usually see after it are part of the argument, which for type names looks like a cast to the type in question. Like any other cast, the syntax is the type name in parenthesis.
