Once again you use a very fragile unit send them to the front and if make even one tiny error you can kiss 360 mp manpower goodbye. Grenadiers should be able to counter the maxim in tier 1 with the help of support units. just as conscripts can counter the mg42.
When they altered and then nerfed the g43 i saw this problem coming from a mile away. standard grendiers cannot counter the maxim in this form.
Because you are supposed to counter Maxims with either riflenades,flanking or support units. And maxims are supposed to counter Grens. Thats how it is. Dont expect to counter the hard counter with the unit that is supposed to be hard countered head on.