Powerful CQC weapons are weak at long range and that is a problem how?
Did certain someone spammed AGs and used them against rifles for long range cover to cover fights again?
SMGs had low effective range compared to rifles IRL too, and that is how you show it in game accurately AND balance friendly, by having them being ineffective at long range.
"game is balanced" is basically the problem here.
Actually read the post before commenting if you don't want to look stupid.
Nobody in this thread has suggested that SMGs being weak at long range is any sort of a problem.
What was said was that SMG DPS (With the strange exception of Pioneer/OST weapon crew MP40s and Royal Engineer Stens, who instead stop doing maximal damage at 8 units, which I assume is just intended to make them weaker) is the same between 0 and 10 range, whereas all other (non-LMG/"sniper") weapons continue to ramp in damage as you get closer to your target, stopping ramping at anywhere between 8 and 0 range.
As a result SMG infantry do not, in fact, want to be extremely close to their targets. They instead want to stand at precisely 10 range, as getting closer means you will take proportionally more damage, and standing any further means you will be doing less.
I'm not sure how this actually affects engagements in practice, and the alternatives would either to be that SMGs continue to ramp FURTHER as they get closer (likely reaching absurd levels of DPS), or to fall off sooner (Which would just weaken them), but the point is that you seriously need to work on your reading comprehension.