Must be me being Dutch and brought up with 4-3-3 the Dutch way than. But 4-3-3 is a system meant to be played with out and out strikers. Lately however, and therefore I can understand your opinion, teams play 4-3-3 with wingers coming inside and actually scoring goals. The latest trend having lefties play on the right and vv. Compare Navas to Robben for exemple. But than what you get is actually 4-5-1 in a attacking style.
Is Barca nowadays playing 4-3-3 or 4-5-1? Do Neymar and Messi play the role of an out and out winger? No, they don't. It's 4-5-1. Same goes for Bayern when Robben and Ribery are free of injury and both playing. If Pellers would like it that way, he should actually play Navas of the left and Sterling on the right. That's why you and I say Lopes is better suited for 4-5-1 coming in from the right. We agree on that.