I use a controller on xbox and I've never experienced "lock on" from any distance. I don't know if it's even working for me at all. There is no snap to target on console. At all. If I see a guy, I have to put reticle directly on them, ads, and fire. If they move to the left or right, my reticle does not follow, it stays right where I put it.
All I see on here is console players saying the aim assists sucks and is barely noticeable, and PC players saying how insane the aim assist is when they try controller on PC. Aim assist is broken. Seems to work op for PC players and not at all for console. If you're getting locked onto by a console controller player, they are probably using a cronus.