Eating mostly plants does not mean one has to have protein deficiency.

Seitan, tofu, tempeh, TVP, etc etc. All plant based, all high protein.

Us Westerners could cut down on the starch, add more salad and greens and pretty easily meet this requirement I think.

I don’t know if we need as much animal foodstuff as we consume but just doing that should be enough.

Are you ignoring the "mostly" in mostly plants?

That isn’t because of being vegetarian but because of poverty.

Then eat protein-dense plant foods like tempeh and tofu.

Source?