You already know you're shooting at the cursor in the center of the screen, so ADS is just an annoyance that adds a step and messes with visibility.

You could not have a cursor on the screen to force its utility, but why bother? One wants to aim and shoot, not aim, bring up some nonsense to your face, retarget and shoot. I'd rather that gameplay additions be placed on improving movement rather than aiming nonsense than makes gameplay more sluggish.

Then again I'm more of a double jump & dash kind of guy.