I meant in support of the HMG 34. A flamenade will force any infantry away from the heavy cover and the HMG 34 will suppress them the moment they do, unless you get unlucky with the burst/reload timing etc.
OKW has plenty of good cost effective mobile infantry to deal the damage, and a mainline that can deny the enemy cover. They don't need a high DPS HMG. The HMG 34 does what it needs to do (suppress) just fine and there's no reason to change this dynamic.
I'd say this is more of a skill as opposed to luck. If you're watching the engagement it isn't exactly hard to wait for bursts to end to give yourself an extra second of no suppression. OKW has great cost efficient infantry in blobs. Try taking 1v1 engangements though and volks lose to literally everything except unupgraded cons. Their support teams are still good, but everything they do is far better in groups. ISGs by schwer, MG34s, raketen blobs. The whole faction just doesn't play the combined arms way and just cheeses the entire game through blobs, schwer HQ, and stuka zu fuss. If that's the way they're designed, then yes the MG34 works as intended.