@BeamMeUp47 There are quite a lot of legends who in some way can interrupt gunplay. Wraith Phase as an example removes her from battle not being able to fire at all. Where with ballistic you still get the option to fire but they will overheat. Crypto ult also highly disrupts gunplay as the slow from it is quite strong. Bang can interrupt gunplay with smoke rendering people unable to see targets so they wont fire. Wattson fences also highly disrupt gunplay as the slow from that makes it virtually impossible to control the movement.
Overall a lot of legends can do what ballistic can just some are a little worse than others. Mind you this is not me disagreeing with you just pointing out in some ways quite a bit of legends can hinder gunplay.