To succeed in a sport, doing it has to feel as necessary as breathing.
Also when young you probably need parents to push/support you, to bring you to training, watch all your games, have a consistent training schedule. DB knows all of this but Romeo was flying around the world and he wasn’t going to tennis camps. Look at Judy (tennis mum). She made huge sacrifices for her son. Romeo hardly appears on the tennis game rankings (they’re on line and it’s how kids build up their rankings).
Tennis was only a photo op really. When you’re rich already you don’t have the need for success to better your life, but plenty of kids take part in national leagues and its a lovely sport to have
Why didn’t Romeo go to any games though as a future champion in the making
The worst thing is his parents made him sound like a prodigy. He was probably laughed off the court. Just like how Brooklyn was probably laughed out of Parsons.