Suppression is pointless . LMGs are useless

The only advantage of LMGs is being able to put lots of bullets down range and 'pin' enemies.

Pretty big advantage if you ask me. Insane multi-kill potential.

Even the SMG - because it has absolutely no recoil - can beat the LMG at mid+ ranges where the LMG should excel.

LMGs on average have higher base damage and have less damage drop off at range. At mid-range the TTK of LMGs is significantly lower than that of SMGs. After the Season 1 patch, SMGs gained more spread and LMGs got less spread. The thing about recoil is that you can counteract it, either by using recoil control, or by using attachments that significantly reduce recoil. The end result is that LMGs now easily beat SMGs at mid-range.