The point of having range advantage (DSR) is to be able to deal damage outside of enemy reach.
Will DSR squad be able to do that without autoknockdown? Absolutely.
AS50 is higher rate of fire gun, which makes autoknockdown even more noticeable.
I will play DSR after taking away autoknockdown, and the rest of teams will have to as well, because there're not that much alternatives.
Less stunlock is good for the game.