Assgrens have sprint to get into range quicker and take less damage on approach.
Assault Sections / Engineers can't use their higher maximum DPS if they drop more models on approach.
Riflemen Has a RA value 0.97 and neither grens/volks from behind heavy cover can drop models from them when charge through neutral cover.
Let me put it to you this way a 3 man ass section/engi has a 40 dps grens have 23(17.5 at range 10) dps. Unless your remaining 3 ass sections/engies have less then 170 hp when they get to that range they are winning.
You don't you test and find out if ass section get cut down by vet0 unupgraded grens/volks first before saying that.