pruning should be done on a required basis. It's not just prune and you get better yields.
While it can increase yield in certain cases thats not always the case.
1.Prune to maintain an even canopy to maximize light and photosynthesis.
2.Prune to ensure you are getting adequate airflow through the plant.
3.Prune to renove growth that is not beneficial to the plant. That will take energy from the plant with little to no benefit in return (Small offshoots that won't amount to anything but popcorn or larf, bigger old fans that are blocking new growth, fans low in the canopy that are not getting light etc.)
4. do not prune ANY leaves that are healthy and removing them will allow light to go right through the plant and be wasted. (The whole point is to keep the healthiest, most efficiently photosynthesizing leaves while removing foliage that is impending them to maximize photosynthesis)
you don't just prune because some guy on YouTube is regurgitating things he doesn't understand.