and since the game was not designed with modern network tools in mind such as rollback (which would probably be too heavy for the Switch)
Rollback netcode has been around since Quake in the 90s. It's not a very new or computationally intensive technology, relatively speaking.
It's more like if you give someone random the power to jail someone without due process, we can all cheer as long as they use the power right. But then if we give that person the power, Hitler also gets the power and uses it to jail Jewish people.