I do agree that "moving" them to backgrounds is fundamentally a nothingburger compared to the Tasha's rules. If the ASIs are floating, that means they aren't connected to any mechanical entity. That's kind of the point of "floating", you justify them with whatever narrative you see fit.Which is completely and utterly pointless.
People complain about ASIs in races, so they make them "floating". Now, they move them to backgrounds, which by default are completely customizable anyway so the ASI are, in fact, still floating; making the "change" utterly pointless.
It's like, when with the devs finally get it. Just make ASI part of generating ability scores or bake them into the numbers by default...
Anyway, bowing out.