And you lose a level of diversity and customization. We can still role play if there's no weapons, or enemies, or VATS, or SPECIALS, or perks. But why would you? That's not an argument.
Fact remains that a character with 90 in guns is different than one with 50. Gameplay and RP wise. Plenty examples have been given. You've given none showing otherwise. Basically you just changed your argument from skills had no RP relevance, to their RP relevance wasn't needed to still RP.
I personally don't believe skills are gone. That would be too stupid on Beth's part.