Suppressive fire is already an obselete doctrine. That’s why the British army is replacing their machine guns with DMRs (Canadian military may be heading in the same direction).
Turns out turning a motherfuckers head into a fine red mist with a 7.62 tends to make everyone else around them really eager to seek cover. The threat of a well placed shot has a far better suppressing effect than the reality of a bunch of inaccurate fire.