I demoed a 2020 Makai with the 400. The 2020s come with the 1.76 trans, so somewhat equivalent to the 2019s with the 450. We had 5 adults and 3 kids, full stock ballast plus 500 lbs lead. It was not lacking in power.
I forgot all about the 2020s and the 1.76 setup. That's cool and would be probably enough for most.