On A Stick

I love the rust monster. They get a bad rep but not every monster is supposed to be fair. Some fights are meant to be mean or require special tactics. That’s what makes the game so fun.

Unless you’re running a random encounter or a pre-published adventure, the DM makes the choice to use the rust monster (or not). Removing it from the game isn’t going to remove their ability to make a monster or an encounter that takes away your gear.