If you ask me, this WC saw a bit of a resurgence of more defensively-oriented fullbacks.
I think it was more of a lack of top (offensive) fullbacks.
I'd say overall Vrsaljko (bias aside) would be my choice as best RB and he's defensively fantastic, but offensively he can't create space for himself.
He'll run, he's got a good cross, but he can't dribble or blow past people, he's not exactly Carvajal/Marcelo in that regard.
Tripper... I just wasn't impressed. Set piece delivery great... but in actual play? I didn't see it, offensively or defensively. He was good, but certainly not the best fullback of the tournament as the English media are putting it.
Meunier was probably the best RB when it came to offense. Shame he missed the semi vs France, he's vital to Belgium's strategy.
Pavard was adequate for France, I just think the team success covered the fact that (at least for the time being) he's a level below most of the other French players (that said, Sidibe was pretty awful in the one game he played).
Kimmich was absolutely brutal for Germany and Carvajal never looked like himself following the latest injury.
Left backs were even less impressive...
Lucas Hernandez is still very young, and was good... but I wouldn't say great. Possibly still the best LB in the tournament.
Croatia's LBs are its weakest link, and noone is terribly impressed with Ashley Young or Rose.
Belgium basically plays without a LB.
And Marcelo went out in the quarters.
Am I forgetting some guys that went out earlier?
Trying to think, but I don't think so tbh. Augustinsson was decent, but hardly spectacular.
So, if I had to pick, I'd take both Atletico Madrid as my starting fullbacks, Vrsaljko and Hernandez - and they're both defensively than offensively (though not terrible offensively by any means).