Even most people who exercise a lot don't
need it. I used to lift heavy weights 5x a week. "Heavy" in this context was 190kg squats, 140kg bench etc., which put me withing striking distance of competitive powerlifting levels for my weight class (for drug tested meets anyway).
I used protein supplements on and off, and there was really no noticeable difference in performance. For most who lift a lot it is mostly because once you get to that level, your increases have levelled off so much that if it increases your performance 1%, that's significant.
Meanwhile, when I first started, I doubled my lifts in the first month or two, and now, after a year off from lifting I'm adding ~5% a week at the moment (those increases will slow down quickly)
So if you really want to reach your very peak, you're willing to put up with a lot of things for 1% here, 0.5% there. While if you just want to stay healthy, you just need to be over a fairly trivially achievable minimum.
That said, my one reason for still paying attention to my protein intake, is that if you set a rough calorie goal, and make sure to eat a lot of protein, my experience at least is that it's a lot easier to keep my carb intake down (put another way: try eating 500kcal of lean chicken breast vs. 500kcal of chocolate and see which one keeps you from eating more the longest) - making sure my first meal of the day is protein rich makes it a lot easier for me to stick to diets and that's a much more important effect for me than whatever tiny effect I get on my lifts.