why would someone put an mg behind a shot blocker, the mg is guna block its own vision 
Bunker spam is easily counted and its not free on the axis side
HMGs and small arms fire don't fire physical projectiles and as such and suppress without having to shoot over terrain. As I as suggesting in my post b4, ATGs have to fire a physical projectile that can be blocked by shot blockers - Think of red ball express where you cant shoot through the wooded areas and are forced to go down lanes meaning it can be hard to clear especially since it spots for itself.
Bunker spam is easily countered in 1s as you can move away and flank around it and your enemy loses field presence but it becomes a problem in larger formats, even in 2v2s it can be an issue all the way up to mid game as I also stated b4. It can come down to map design normally but most of the times can be bypassed as cover and LOS blockers are destroyed. Early game it can be hard to clear since you can locked down with s-mines meaning you are going to lose models while you clear. all in all mix all of that together and remove the penalty of field presence since its 2v2+ which means you cant push that point till you get a light/med tank that can take the damage.
I shouldn't have to explain this rly, the main problem is that it spots for itself and with that first volley suppress followed by the second volley pin and large AOE suppression means you can get pushed off super ezpz.
I understand its not free, for OST that muni is really important especially since your mid-early game AT is rather limited. OKW it can be easy as your units are rather cohesive with long range volks and close range Strums STGs meaning you have extra munit to spare in either mines or more bunkers.
The problem with the bunker doesn't rly arise -or at lest in my case- til late game when VPs become an essential point and where mortars and other indirect guns have obtained high vet meaning you "bleed like a stuffed pig". Introduce the idea of long range TDs and maybe even a pak43 or a Lefh and you have locked out the allied team.
Im not saying the bunker causes all of that but that late in the game and to have a hard position like that requires more than just a simple sturmpio squad to wipe like what you can do with the fighting position -b/c of its armor value-
I shouldn't have to prove to you people why self spotting emplacements with a long range and suppression is a problem not to mention cheap and effective with 1-2 burst vollyes to hold back an enemy. Not even the bofors or the 17pdr completely self spot.
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