Too late. Upthread, I've already broken down one of these backgrounds and used it to highlight something awful and negative to justify changing the way ability bonuses are assigned...
And frankly, I don't regret saying it. I find it absolutely absurd that D&D continues to use mechanics which associate only certain, specific character origins with high Intelligence. As if absorbing, processing, and recalling knowledge is somehow unique to one particular lifestyle.
Even if a game mechanic which ties ability scores to specific backgrounds didn't have any potentially problematic implications at all, it would still interfere with character creation. It would, for example, make it extremely hard to ever implement the classic "diamond in the rough" trope, where a character from an unlikely background just happens to be extremely good at something they have no right being good at when suddenly given the chance, just because they're awesome like that.
I appreciate your take on this. I understand it. But can I ask you to look at intelligence a little differently?
If you view it as greater exposure, which often leads to the ability to apply that learned knowledge. You are viewing it as purely innate, and when it is viewed in that lens, I agree with you. But if you view it like strength, meaning someone can be raised to train daily, be it with a smithy hammer or mining pick, and add muscle. This, as opposed to the someone who worked in the library. By eighteen, those two might have different bodies. And the smithy might be able to apply that accrued muscle mass and hammer knowledge to fighting, whereas the librarian, maybe not so much. They can apply other things - war tactics, reading maps, etc.
Intelligence can be viewed the same way. It is not innate they are discussing with backgrounds, but exposure. In the PHB it states, "Intelligence measures mental sharpness, ability to recall information, and skill at applying logic." If you look at these skills, they are all skills that can be practiced and honed. The ability to recall information is practiced everyday, often hundreds of times, by that librarian. The greater the exposure to logic, thinking in terms of math, using the scientific method, and being involved in deep discussions regarding how to solve complex problems, gets better with practice. Sharpness too, can wane when repeating mundane tasks day in and day out.
Anyway, I hope this helps you see my side of the picture.