I'm a bit tired of these "modern game" nonsense, it's not a thing nothing done today is new, what people are thinking about are theoretical trends that don't actually work for most teams and are limited to very specific players in very specific systems. In sport everything is about balance, imbalance and leverage, there are many ways to skin a cat. For example we do not need to have two attacking fullbacks in order to have width or be dangerous wide, the beauty of someone like AWB is that if we simply help him improve defensively, which is already his strength, then we can afford to have a very attacking right side attacker and we can also afford to have a very attacking left side fullback, the formation would be asymmetric but it has never been an issue in football.
France and Barcelona(Abidal-Dani Alves) are an example of that, Pavard won the righback role because Mbappé can't defend but since Mbappé moves around and very often run inside channels, Pavard find himself absolutely alone on the right wing and that's a very important thing because almost all football players can pass and cross a ball what differentiate elite players from the rest is their ability to be accurate under pressure and with speed, if you give space and time to a player he will be a big enough threat, which in the case of Pavard-Mbappé means that you always have to chose between giving Pavard time and space or following Mbappé, generally teams will do the later but as Pavard showed it's not a good idea in a low scoring game like Football, he will find himself in a very good position once or a twice a game.
In theory anyone can provide width outside of your CBs and one of your CM/DM. If you use a flat midfield three the wider CMs could run the channels inside or outside of the opposing fullbacks with your wide forward/wingers staying wide or running inside. It all depends on your players and their characteristics. There are so many ways to do things that I find it a little bit disheartening to see football fans and coaches consistently limiting their options with trends that have no relevance to the context they are observing.