A prime argument against ranked choice voting is - there's nothing particularly wrong with the current voting system. Why change? What could that change bring that we don't have today?
Yes, we had a dismal 2016 presidential election, with two decidedly flawed candidates. Even the third party candidate sucked that year. The 2016 US election was a perfect storm of lousy choices.
That isn't the fault of the voting system. It's the fault of the parties for letting the situation devolve, and the fault of the voters for not demanding better.
Doesn't matter what voting system you have. As long as you have an electorate who is so easily distracted by smokescreens and irrelevant platforms, and doesn't focus on what is important for the future of the nation, you'll get poor results.