Short and simple: make it reduce the sound volume or the audible range of the sound for Active Camouflage system instead of the Turrets Detection range modifier.

I dont say make it remove the sound, only harder to detect.

This would maybe break the dominance of Bess Builds on Stealers and give more options. That would on the other side make heartbeat detector or camouflage sensors array more attractive.

It would make the game more dynamic.