Lets assume you are right, then yeah IS would be one man more for slowing down tech a bit.
What I tried to say: Someone said lets buff USF mortar to Ost level and move howitzer to doctrinal. Vipper answered that would be OP versus Ost because of small squad size and static gameplay. But on the other side who is more static than brits? Completely static mortar and IS squads that seek cover like a magnet because of negative out of cover modifiers and mid-long range weaponary plus small starting squad size (which can partly changed via side tech). Brits are the embodiment of static in CoH2.
I just wanted to say you can't claim an argument for just one faction if it is very similar or even worse for another one.
Let me explain this differently. Ostheer UKF much up is completely different than USF Ostheer much up.
IS section beat Grenadier section in static play. Ostheer mortar was hit very hard with nerf and is not really that good anymore. The much up will no be won by spamming mortars.
Riflemen can beat by used aggressively to flank Grenadiers can not. The USF mortar is currently only slightly weaker than Ostheer one. If USF are able to win in static the Ostheer will have little option since they will lose static and will also lose if they launch an attack.
USF mortar was tested being equal to Ostheer one and was proven to be simply OP.