I am extremely in favor of RCV as long as it applies to the national level.
It CANNOT end at the state level. If my electoral vote has a chance of being wasted on a 3rd party candidate that has no chance, then the system is EVEN WORSE than our current system.
As an example, if there was a chance that Trump could win because a few electoral votes went to Bernie, I would just put Biden as my first vote. But if the electoral vote would also shift to the next available candidate, then I would vote Bernie first.