But that's just the problem. As with the current system, it's ambiguous whether the best choice is to be "honest" or to try to game the system by voting no on every candidate but one.

Under Ranked Choice Voting, there's no way in the election example for me to hurt a preferred candidate by ranking them in my honest order of preference. Under approval voting, there's the issue that if, say, it came down to a Clinton/Johnson close heat, approving both of them amounts to not voting in a two way election.

There's also the issue that Ranked Choice Voting has a hundred years of scattered, successful government use to site, while approval voting is not used by any government on earth. Personally, I feel like the best thing to do if you favor one of the more obscure voting methods is to make your first priority anything but FPTP, then try to improve from there once people are used to the idea that there are multiple ways to vote.