Neonchameleon
Legend
Even if they do it's not the fighter dominating the social scene - it's the fighter being helped by the wizard. And if instead of it being a wizard we've got a bard, a sorcerer, or a warlock probably with a +10 (or possibly +15 from the bard) why would they necessarily not want to demonstrate that they are a more flexible and well rounded package and better able to handle social situations than the one trick pony who's been lording it over them because he's better in a more narrow range of social situations.Wouldnt that spellcaster be better served, casting Tounges on the Fighter?
The only way your fighter "dominates" the social pillar therefore is if they are either in the narrow range of situations where a straight skill check applies or they are actively helped to do so by the rest of the party (possibly because they are missing a natural face character). Like I say, mid tier as a face. Powerful but limited and requiring the support of the party in a wide range of situations where other faces could bring their own magic.
And the other problem is that even when your fighter is technically very good at the social pillar the way they are is boring. They just have a big number to throw at things. There's no e.g. using Disguise Self to become a quick change artist and be someone else for a while. There's absolutely zero "I've got in to the duke's bedroom but now he and probably not his wife are coming in to have sex and I need to stealth my way out". You're a one trick pony. Its all Persuasion-Persuasion-Persuasion-Insight-Persuasion. Which is the other reason that although you are very good at the one trick you're hardly dominating any game that has interesting social situations.
No I'm not. You're missing that that was the design goal - and they didn't quite succeed.You're missing a key design choice of 5E. Spells no longer 'auto invalidate' other PCs, and are almost always better off being used to buff the guy that is already very good at something, to be better at that thing.