It’s just a basic physiological principle, eventually you are constrained by your genetic potential. It’s more important to be ‘not weak’ rather than the strongest person in the world. I’ve been a strength coach for elite athletes for years, it’s amazing how much of a difference strength training can make intitially. But at a certain point it makes almost no difference if you add a few pounds/kgs to a squat/clean etc., it just becomes a waste of time chasing numbers. Those smaller numbers are also far more difficult to achieve than those initial gains, so it’s important that weight training doesn’t become everything.