I guess I will just disagree with this. The most common check I see in campaigns that are even combat focused are skill checks, which use a variety of abilities.
Yes but an extra skill proficiency is worth 4 points on that skills ability at 1st level, rising to 12 points at 20th level. The good races have more skill proficiencies or abilities that let them auto succeed, do the checks for less cost or get advantages on those checks, when others wouldn't.
For example:
Damphir gets 2 extra skill proficiencies in addition to being able to climb walls like a spider (bypassing very common athletics checks for climbing) and doing it at a 35 move without using an action.
Similarly a Shadar-Kai or Eladrin, have an extra skill proficiency, and can teleport both to escape grapples and often when other characters would have to make an athletics check to climb. Additionally they can do it as a bonus action, so instead of making an athletics check to escape a grapple, it is an auto success and they still have an action, and a Summer Eladrin can put a charm on with the teleport, potentially giving her advantage on any following charisma checks she uses with her action.
Any of the flying races rarely need to pass a climibing check at all.
A Goblin with a 10 dexterity is going to better at hiding in combat than a Wizard or Fighter of another race with a 16 because she can hide as a bonus action every turn, allowing a second check as a bonus action if she fails the first time.
Now yes, there are some classes that are just not as good as others. That, however, isn't something for ability scores to fix. That's for the designers.
I don't think it needs to be fixed at all, and there is as much disparity in the races and many of the subclasses as there is in the classes.
I guess IME differences in ability scores is a balance concern in a bad way a lot less often than imbalance in the classes, subclasses or races.
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