I agree with your assessment. Higher rate of fire and more
intense firepower does not compensate for less men. One of the key
factors is attrition. Simple maths.... say the SAF section of 7 men
with their firepower can kill the enemy at a ratio of 3:2 , i.e.
for each of our troops killed, 1.5 of the enemy is killed. The
enemy section of 11 men, will outlast our section of 7 ! Simple
maths !
Also, with more troops , in a static battle, your frontage is
wider. From historical events, the side with the larger frontage is
going to have many options of outflanking ( or turning the flanks)
of the narrower side. It's jsut like football. If your flankers are
strong, the other side will be forever be forced into a defensive
game, always shrinking towards the centre to protect being
outflanked and by-passed.