I was thinking more in terms of practicality than formal rules. When I'm driving, I don't insist on right-of-way with large trucks.
It’s a different situation at sea. Here we have two power driven vessels in open waters. One ship is the give-way vessel, required to maneuver to avoid collision and the other is the stand-on vessel, required to maintain its course and speed. And the determination of which vessel is which all has do with how the two ships are meeting, crossing or overtaking. It has nothing to do with the size or speed or maneuverability of either vessel.
While the stand-on vessel is not required to maintain course and speed until the the give-way vessel hits it, unnecessary maneuvering by the stand-on vessel can easily turn what could have a straight forward situation into a total charlie foxtrot.