Is it? This hasn't been my experience at all.
Just because you say this is an issue that needs to be acknowledged doesn't make it true.
I personally find spamming HMGs not an issue, because it has counters. Sadly, the counter to it is not flanking. The TTK a mg42 team is too long: If you get flanked, you can easily pack up, get a few steps back and set up again - all while under fire.
Either reduce support weapon crew survivability, or give conscripts more dps - i would like to see an svt40 upgrade for 60 munitions.