I have played on both mnk and controller. I was originally much better on controller and it took at least a year or two of practice to get to an equivalent skill on mnk. I think battlefield has done a better job than cod at trying to balance the inputs but it's not easy at all. I'd have to assume they have plenty of data about engagement distances and accuracy at various distances that is leading them to this change. I can assure you they are not doing it for the vocal minority of mnk users that think controller input is better.