Alright, are you really going to force me to explain the exact same thing repeatedly as to why your view doesn't work and ignores important parts of reality?
Under Ranked choice, the person could vote for whom they wanted in the 3rd party and then have the other pick being the "Electable" candidate so that people can vote for whom they want without it being a spoiler.
That option doesn't exist in the current system which actually makes 3rd parties nonviable.
If 3rd parties aren't viable and only act as spoilers and the 2 big tents don't allow open elections within their ranks and letting the voters choose, then the voters aren't given a fair choice. Until your logic quits ignoring these facts, you will continue to be wrong because you keep ignoring important, game changing, information.