None are capable of behaving or thinking this way, not even Thiem who is 27. They're all narcissists (except Med), obsessed with their brand on social media, amassing fortunes and doing nothing of consequence in the business end of slams. Ask yourself, why is someone like Shapavalov rapping and being on social media constantly instead of working his ass off with Youzhny to improve his point construction and net skills? They prefer adulation on social media to actual results in big tournaments.
Sampras went years without even a girlfriend because he was single-minded in his pursuit of excellence. Someone like Zverev is more interested in posting pictures of himself lifting weights on Instagram than improving his game and mentality. That's the crux of the issue. Lendl addressed this in 2016, saying, "these young players are just on their phones all the time, it's a big reason they're not stepping up to the plate. Throw the phone away and get down to working, working, working."