2 & 4 are so crucial. They represent what 1 & 2 mean. Otherwise you have just put an idea in the ether, floating like Forrest Gump's feather but without truly communicating it to anyone in particular. 2 & 4 are the attempt to connect the idea to something in the other person's mind. To make it resonate with them (think about the physical meaning of that word). Or as another commenter put it, "why is it useful?"
It's always possible that your idea with land with something by accident, but it will be by accident and it may not land with the person you intended it to.
A similar pattern I try to use frequently is this:
It's always possible that your idea with land with something by accident, but it will be by accident and it may not land with the person you intended it to.
A similar pattern I try to use frequently is this:
1) what it is
2) what it means
3) an example