the duopoly sucks but they are mostly right. in competitive states.
consider something small like when do we have the block party and two dates are getting most of the votes and either is likely. if you prefer one date over the other, but really want a date nobody else does, it makes sense to change your vote to the one of the two you prefer.
but we really need the Alaska model everywhere.
https://time.com/6112318/american-democracy-final-five-voting/