That's not what I mean. When you see an instance of explicit `isCommentSpam` used, you know immediately that it is using the CommentCache. Compare:

    if (isCommentSpam(423)) {
        doSomething();
    }

    if(isCommentSpam(423, commentCache)) {
        doSomething();
    }

See, the fact that the first kind uses the CommentCache is completely opaque to you when you're reading the code. You don't know it does until you actually look inside `isCommentSpam`. The second way, you can trace the flow of information through the program very easily.