The Big10 and PAC12 put the most emphasis on it. They generally want schools to be not just Tier 1, but ideally AAU.
In the Big 10, I believe every school besides Nebraska is AAU, and they were when they were brought in.
In the PAC 12, Washington St, Oregon St and Arizona St are the only 3 that aren't AAU, and they're pulled up by still being Tier 1 Research and paired with their stronger in-state rivals who are AAU