I agree for lots of it except the 2:1 ratio of mgs. Mgs are the hard counter to massed infantry. On close quarters maps having 3-4 mgs is just not realistic because a.) theres smoke and b.) Mgs have to set up before the blob arrives and be facing the right direction. Id counter them differently with indirect fire.
Ofc, you're right. That exactly why I also wrote about other sources of surpression. The ratio is more of a theoretic number assuming infinite space but it takes into consideration smoke, flanking and it works quite well for small numbers for example up to 5 squads in a blob (that can beat 2 MG's but cannot beat 3 of them).