Hmmm maybe. I don't really want to pull out my AD&D books right now, but I remember for sure that in B/X ability scores barely mattered (is this a word? ok, this is a word now) and skills were just D6 rolls, sometimes influenced by ability modifiers (like Open was influenced by Strength and Stealth influenced by Dexterity).
Oh the scores absolutely mattered in AD&D.
There were minimums & maximums for races & stat requirements for classes.
And then you got into what each stat did.
Str? Mattered for melee hit/damage and bend bars/lift gates/open doors
Dex? AC, initiative, & ranged weapon to hit. Also added %s to thieving abilities
Con? +HP And it affected your odds for surviving System Shock & Resurrection success. Get your con high enough & you could actually start regenerating HP damage like a troll.
Int? # of Languages & if you were a Magic User (aka Wizard) how many & what lv of spells you could learn
Wis? Bonuses on some Saves & was important to Clerics/Druids spell casting as Int was to the Wizards
Cha? Reaction modifiers, how many henchmen & followers you could have & how loyal they were to you.
And once the non-weapon proficiencies (aka skills) were introduced, the higher your relevant stat the better.
There was more room between where the -/+ modifiers kicked in on the scale though in both AD&D and Basic.