I think it has been demonstrably true for maybe a good decade and half. As to why some people use alternative methods… maybe because they like it like that? Or maybe because they can't use Bluetooth for some reason? Or maybe they don't know better? Ask them.
Select a file, tap on "share", tap on "bluetooth", choose a device, wait a few seconds, done.
Select a file, tap on "share", tap on "bluetooth", choose a device, wait a few seconds, done.