I don’t think it does. The benefits are fixed. Every Acolyte is smart, wise, and charismatic, none are tough, strong or nimble, and they all learn to use the same skills and tools, and speak the same language. Saying “we’ll, you can be an Acolyte but say you’re actually a farmer” doesn’t really fix the problem, any more than saying you can play an orc but call yourself an elf would have fixed the problems with fixed species ASIs.
I don't think this accurately reflects the narrative of the world. Just char op for PCs.
Noncombat NPCs (let's say an Acolyte) are not naturally optimized or have ability scores of 15+ (unless the DM wants to do so). It makes sense to me that if your background is as an Acolyte, the character's focus would be on those three ability scores, because those are the most relevant scores to the background. Esoteric Knowledge, Spiritual Connection, and Force of Will and Influence.
A generic Acolyte isn't generally doing weight training. But a strong person who becomes an Acolyte can still start with a 15 Strength, and a Wisdom and Charisma of 13 each, but their Acolyte background is going to focus on enhancing relevant abilities. Maybe their Wisdom and Charisma becomes 15 and 14, respectively, and they still have their natural 15 strength. I WISH I had those stats as a human.
Honestly, for 0-1 level NPCs, I'll just give them a Background and no class levels. They get the abilities, skills, tools, and maybe the Feat that make sense for that background, and that is an easy, solid NPC.
The way it is built now makes total sense for a certain kind of gameplay (hard choices that matter), but we all also know the DMG it is going to blow it wide open for the veteran players and DMs. It's literally a non-issue. We'll still get to play the way we want to play. If you have a restrictive DM that wants something different than the players, that is a completely unrelated topic.
I would be more frustrated if there was a perfectly optimized background for each class. There is no choice in that scenario, and would make more sense to be part of the class if that was the case.
It's like people don't want flaws and only want perfection. Flaws make the story interesting to me.