Most plant protein concentrates are not an acceptable substitute for meat, because their very high prices make obvious that their production is less efficient than that of meat, i.e. it requires a lot of extra energy and chemical reagents.
More than half of my protein intake comes from plant sources like lentils and wheat, but I cannot raise that percentage to 100%, because I gain weight immediately.
Fortunately, I do not have any problem with gluten, so I can enjoy bread that I bake at home, which is tasty and which has a negligible cost per protein content.