My own theory is that it takes a few years to develop the mind muscles connections, and for all the neglected muscles to be correctly worked and reach a whole body equilibrium. After that you know how to use the exact muscle group for a specific activity or movement, and every muscle is trained. Weight lifting or Yoga can both get to that, or any activity as long as you are mindful about movements and muscles involved, and every muscle is worked. It seems obvious but a lot of people don’t know and feel their muscles and their relative action when they do a movement like getting up or grabbing something.
Yoga will never produce the same amount of body strength or power that a good, sustainable, compound barbell program can.
I do think there is a place for Yoga in giving our bodies different kinds of movements so we experience our body in different ranges of motion and positions but Yoga is nothing like compound barbell training (whether it's powerlifting or olympic weightlifting).
