No because sandbags are not available in the same way:
Ostheer: Pioneers can build them but Grens can not
OKW: Sturms can not build them but Volks can
Soviets: Engineers can not build them but Cons can, Penals again can not
USF: No sandbags non-doctrinally but tank traps that also give green cover
UKF: Only mainline can build them
With this proposed change every faction would have sandbags available for their engineer/builder unit and thus making all factions even more similar and boring.
i disagree. requiring engineers would be better than it being on mainlines, because then you require a unit to fortify that isnt the most plentiful squad you are going to have on the field.
you dont REALLY see sandbag spam from ost BECAUSE you cant just slap one down with one of the 4 squads you have on hand to fight and clear garrisons and snare like okw can.
sandbags wernt really an issue when soviet could only make em ei5ther, becasue cons were no your main fighting force, thusly you were not able to saturate the map.
theres nobody up in arms about how engineers lay mines and how that mkes the game boring, and like mines, different engieeers could have different fortifications.
soviet have the bags they have
ost keeps their bags as is (or rework bunkers...)
usf (while they dont have baqgs, have green cover tank traps which are almost the same, just a bit jankier to use)
brits could lose the bags all together and just use trenches and okw, probably give them normal bags like ost but built quicker unless there are alternatives.