I believe that Wi-Fi points are more accurate than towers especially when they're sharing the information with indoor retailers

Bluetooth give a lot more information about your surrounding (what device your phone detect or connect, for how much time, distance from objects, etc.), not only from your phone alone, but from other people phones who have bluetooth on and e.g. never disable any tracking from google services too. And the Mac address for bluetooth never change, so any device (and tracking company) will know you is forever you. Bluetooth is a privacy nightmare, and this is totally a dark pattern. People not knowing what they're doing is of course a thing, but it seems just a usual bad practice by google, who like to manipulate especially not tech-savvy people