There is absolutely no nutrient, no protein, no vitamin, no mineral that can't be obtained from plant-based foods.

All red meat contains saturated fat. There is no such thing as truly lean meat. Trimming away the edge ring of fat around a steak really does not lower the fat content significantly. People who have red meat (trimmed or untrimmed) as a regular feature of their diets suffer in far greater numbers from heart attacks and strokes.

Consider the biggest animals on the planet: elephants, and buffaloes, and giraffes. These are vegetarian animals. They grow to thousands of pounds of muscle and bone without ever eating cheeseburgers and pepperoni pizzas.