1) Read the context it has been argue that IS do not have an advantage from sight bonuses because they can scout the enemy HMGs.
2) A vikcers with LOS firing at max ranges will suppress just fine.
vickers problem is you need to maintain vet for it to do its job (control blob). Actually I would agree with you it can do that once vet.
Buuuuut once you get decrewed it's useless midgame and will just get frontally beamed dead by obers and other fun axis infantry. Then you have no suppression platform as vet inf can just frontally kill it. This is a major teamgame problem where vet teamweapons don't stay alive long.
I know you like tests so you can test it yourself
Vickers should have it's high DPS unlocked by vet and instead of vet suppression should have that made stock. Easy fix