There are plenty of plant sources of Omega 3. Flax seeds, walnuts, soybeans, and canola oil all have decent amounts of omega 3 in them. As for protein, legumes generally have a bunch.
Really, the only thing a vegan needs to supplement is B12, but even that gets added to a bunch of stuff like breakfast cereals and plant milks if you consume those.
Flax seeds, walnuts, soybeans, and canola oil all have decent amounts of omega 3 in them
They also take an enormous amount of resources to cultivate and process at industrial scale.
Wait until you learn that industrial 'murica isn’t the entirety of the planet.
You can make your own plant milk usually by soaking/boiling nuts/seeds in water and then blending that together. Some people use juicers for this, and then some people run the blended liquid through a filter to remove any bits. Cashew milk is lovely if homemade!
But why call in Milk then? Shouldnt it be called Nut juice or Seed juice?