I'm new to dnd so it did surprise me how little ability modifiers impacts our dice rolls. When I made my character have +4 persuasion I expected them to be really persuasive in game but that's not necessarily the case.
For example if the target is 20 with +4 ability modifier +4 reduces the target to 16 so it only helps if you specifically rolled a 16,17,18,19. The other 16 outcomes would have failed or succeeded even if you had 0 ability mod. That's an 80% chance that +4 ability mod doesn't help at all with your roll which seems high to me.
I know it can't be changed because its dnd but I'm hoping there will be mods that allow us to double the strength of ability modifiers, it would make our skill choices more impactful while reducing our chance of failure if we invest in the appropriate skills.
Otherwise, I think Larian is already handling it the correct way by giving us multiple chances to pass dialogue checks in some situations.
