We are not lacking protein in our diets

Doesn't mean that we can't look for more environmentally friendly protein sources, or cheaper ones, or open up more options to replace the carbs that are badly overrepresented in the average American's diet, or explore new potential flavors, or use this as a supplement for other nutrients it may contain, or any number of other perfectly valid reasons to explore a new food source. More knowledge is better, it lets us make decisions that more closely fit our needs and gives us more flexibility in solving problems.