That said, I do agree with the Green Party Power statement that RCV, or any ranked voting or plural voting system, is not in and of itself a cure-all, or close to it. (And, in case it's not clear, that this needs to be across the country, not just Maine.)
And, having been in extended discussion in a Facebook group about Greens and RCV in Oregon (group is "open" so not violating confidences), while I'm not wedded to any one alternative system of voting, I am most certainly wedded to opposition of people who seem to think that their particular ranked choice system is the best even when they claim it's not. And, to the degree that approval voting does tend to elect more moderate candidates, I am wedded in opposition to it. Approval Voting on Wiki.
I need ConservaGreens no more than I need ConservaDems.
That said, I did freely admit that it would surely be easier to recalibrate voting machines for approval voting than RCV. But, the idea that RCV is a possible dead end, possibly harmful to the whole idea of alternative voting or that only RCV is vulnerable to what happened in Burlington, Vermont (Bernie-ville!), rather than noting that NO alternative voting system to our current voting plurality system can guarantee a majority winner? I am wedded in opposition to that, too. I stand by my observation, otherwise, in discussion here.
Update, Dec. 25. Range Voting, with its problems as well as goods, at Wiki.