I believe that for (normal) users, the difference between one automatic weapon bullet is not that big.
True, but if I lose a fight because my enemy survives one extra bullet - I will feel cheated.
For casual noobs this isn’t indeed a big issue - though once we get into “sweaty” fights where miliseconds count, 50% less effective damage from SMGs is a huge disadvantage.
Some factions have more equal balance than others lol