There's no need to 'carefully craft a fun metric', if you're honest to yourself you'll notice that plant-based nutrition is the only sustainable way to feed billions of humans on this planet. But I'm curious, which micro- & macronutrients do you think are only available from meat and cheese?

Meat isn't a health food. Most Americans eat an unhealthy amount of meat. Especially red meat. You could probably eat half as much meat and not be in any danger of not getting enough macro nutrients.

Which macronutrients and micronutrients are those?

Perfect choice! Just try to keep beef at minimum, if you can, because it is the most damaging one for the enviroment.