I see you are unaware of what the problem was. Each weapon from Grens did 16 damage per shot. 16*5=80. There are often occasions when Units like Rangers/Paras/shocks charge in they have a leading model this mean all 5 gren models target that one model and in 1 volley kills it. Even if you think these guys have lower damage this is what caused them to be able to take down much stronger squads. This problem was prevalent when sections used to be OP. There are some fundamental mechanics that goes beyond dps numbers. Like let me give you a FPS example. In CS GO the m4a4 has a dps of 366 while the awp(sniper) has only 79 dps. But people will tell you that awp is a lot stronger than the m4a4. DPS means nothing if get insta killed.
In the case of shocks, evidently you forgot that shocks have 1.5 armor so even IF all the shots from the 5 gren models were to roll hits, unless they also ALL rolled pens they wouldn't actually down a single shock model.
Against paras, you need to knock out at least two models before you start trimming off their firepower since the Thompson paras have 4 Thompsons which are favored over the m1s. Lmg paras you'd need to take out 4 of them, but against lmg paras the grens have to charge anyway and the likelihood that you'll land all 5 shots on the same model while on the move at mid-long range with grens is so statistically improbable that its not even worth considering.
But even if I grant that a single model of these 6 man elite infantry squads is downed early, do you really think that the 5 man gren squad will be a able to stand toe to toe with 5 shocks in close range? Or 5 Thompson paras in close range?
Yes, against units like conscripts, non bren sections and stock rifles this is a big deal. Its largely irrelevant against elites-or at least not significant enough to tilt an otherwise fair engagement in their favor.