Not sure. Great forwards and players are often selfish. And Pogba isn’t. He creates. All the time. But as a natural creative and artist, he was always going to see the opportunity to create something special there.
And the ‘truly best players’ are often put into that bracket by scoring goals like the one he tried to score. In general, I agree with you, but in this particular case, I think there was a strong enough opening to shoot. Taking on a very difficult shot I can agree with, but although Martial was in a better position, I think Pogba was in a good enough one to be selfish. You mention Messi, but his star was catapulted when he scored that goal against Getafe, and I’m pretty sure that passing never occurred to him once he passed that last defender. That can wait for other opportunities, at that moment, he owed it to himself and almost to football in general to try and score. Only difference is that he did. Of course, I don’t expect him to always do that, and he doesn’t, but I’m confident that if he even today, if he had run the length of the pitch and worked himself into a good shooting position, he’s not looking up.