[Worf]

And if you eat a somewhat varied vegan diet, you don't need to care about whether you consume complete or proteins or not, as they complement each other.

Just like if one type of food had the perfect proportion of fat, carbs and protein, it doesn't mean it's better than a varied diet of foods that are way off in that proportion, but in different directions. (Obviously a "perfect proportion" doesn't exist and varies from people to people, but I used it for the example.)