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This is going to be my last reply since we've gone back and forth like two pages already and I don't want to spam the forum.
Mortars are actually quite good at dealing with non-support weapons. In any kind of infantry engagement, cover is important. Mortars are great at forcing infantry to move out of cover. I'll be honest, I don't know how much experience in the game you have, but I have learned to not underestimate the mortar.
Yes, flamer 251 is very good at dislodging defensive positions. That is if the defensive position does not have a ZiS gun. The reason 251 is meta is because you can rush it. The reason M5 AA is not meta is because there's not much reason to get it when you can get a T70.
As for the larger squad sizes - of course indirect fire is AoE. But because larger squad sizes means they are often more spread out (along with the extra men), indirect fire generally isn't as strong against large squad sizes. If you were to tell me that Conscripts were not more resistant to rocket artillery than Volks or Grens, then I'd have to say either you've never played Axis or you're just lying. As for the sniper, yes, the Ostheer sniper fires faster, but now you're ignoring the actual point, which is that it still takes longer for the Ostheer sniper to take out a Conscript squad than it does for a Soviet sniper to take out a Grenadier squad. Furthermore, the Ostheer sniper is much more exposed because he has to take more shots. Finally, yes, 6 man squads mean you have to spend pretty much the same manpower (sometimes more) on reinforcing, but keep in mind - 6 man squads can hold the line much longer for you to bring other squads and team weapons into the fray. 6 man squads are also harder to wipe (especially on retreat). This is something you can't deny. And before you give me the stats on Conscript target size and stuff, remember that the game isn't just about numbers. You have to apply those numbers in context. A 6 man squad will always be harder to wipe on retreat than a 4 man squad, because there's more targets (since the retreating squad sprints faster than pursuing squads can keep up, there's a higher chance of more models escaping), and the modifiers that the retreat status gives when combined with the larger squad size evens out the disparity in target size/received accuracy.