I think the difference is that old school wingers had full backs behind them, and wing backs do not.
I also don’t think this debate is particularly subjective. Amorim has described the role, and done so specifically in response to questions about him using Amad there. He said the role is ‘just 1v1. Going both ways.’ That clearly dictates that the role is equal parts pffensive as it is defensive.
I also think the attacking aspect of the role is not even necessarily the point. You can’t play offensively from the inside, or from the outside. Even if both offensive, it is a different game. Cunha, for example, is coming to play as an attacker. If ‘wing backs in Amorim’s system is another attacking role’, should we consider him for both? The fact is, his own skill set is more suited to a particular type of attacking than the other. He’s jot suited to running the touchline. Jeremy Doku, for example, or Anthony Elanga - are better equipped to attacking in this particular way, even if we say that both roles are attacking roles.
I don’t think Amad is best suited to running the touchline all game. He has a lot more to offer inside than just this.