I don't think a majority of people are caring at all about the nutritional quality of their beef when they're eating a hamburger. I only see these arguments come into play as counters to vegan food. Everyone becomes a nutritional expert when vegan diets are mentioned.

https://en.wikipedia.org/wiki/Tryptophan#Recommended_dietary...

  Soybeans: 0.59g/100g of food
  Beef: 0.23g/100g of food
  Chickpeas: 0.19g/100g of food

Doesn't look like a vegetarian or vegan diet would cause any sort of tryptophan deficiency.

The ancient solution is to pair them with rice or wheat.

Isn’t tryptophan the thing that makes you sleepy.