Michael Jordan and Kobe Bryant didn't prioritize nutrition, but today's athletes can't afford that luxury. Strength training is now baseline. Proper nutrition is what separates you from your competition.
Michael Jordan didn't focus on his nutrition. Kobe didn't do much with his nutrition. Are you Michael or are you Kobe? If you are, then you should be in the NBA by now. If you're not, then you're gonna need all the help you can get. The competition in sports these days is wild, and you need to take advantage of anything that's going to help separate you from the pack. Strength training, it's a standard now. You should be strength training. The next thing on your list should be nutrition and dialing that in. If you're not doing it, then you're already falling behind.