I think we are dancing around the same idea, but I don't get my point across.
I agree that the game shouldn't be combatcentric. What I'm saying is that there WILL be optimizated builds for exploration an social interaction. There are already such builds, they aren't very prominent because those legs of the game are minimal currently, and combat trumps all. But there'll be a "best way to build a social character" and a "best character in exploration and trapfiniding" builds, just like there are now "best tanky build" and "highest AOE dpr", or whatever. There will be a "best all around character" too. When you have a combination of choices (like class, race, theme, background, feats, spells), some of them are going to be mathematically better than others. For example, is probable than an Fighter - Archer elf with long bow is matthematically better at long range DPS than a halfling Paladin- Peasant with shortbow. Nothing stops you to play a halfling ranged paladin if you have fun with it, but it'll be subopimal. However, the same is true in videogames. Nothing stops you to go play WoW or Diablo 3 and build whatever character you like, within the rules. You can go and build a D3 melee Demon Hunter, for example. There are bilds like that in youtube. It's going to be inferior to the cookie cutters, though.