Fact remains they do not have 90% accuracy on the move (and 80% is not 90%). The modifier on its own does not say much and one should be looking at total DPS.
Allies also have infatry that are "excellent for chase down wipes" while VG and grenadiers are not.
I was just commenting on him using accuracy. I agree the modifier on its own doesn't say much, I wish there was a way for the game to show what certain increases due such as acc/cooldown/moving acc/reload etc..
However moving on to total DPS, a stationary PF G43 does 9.418 while moving does 8.266 which means almost 88% of total DPS is maintained. Drops to a bit above 86% with VET, giving a quick look no other weapon maintains that level of performance on the move which is why it works so well in blobs.
Again I am assuming Serelias numbers are accurate.