Not meeting protein macros

I am NOT a vegan or a vegetarian. In fact I struggle to eat veggies for a number of reasons. Though I hear a lot of vegans or plant based people attribute lack of protein and muscle development due to low calorie intakes. Which makes sense. (Too big of a calorie deficit) As long as one is getting enough calories supporting health and performance, consistently training with progress, checking all the other boxes off, muscle should develop? Not saying to avoid protein macronutrient, or that food sources don’t matter. I am wondering how efficient is the human body in extracting amino acids from various foods when not given concentrated sources of protein? Ie meat.

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