Profile of nee

There are already penalties to AT squads, problem is that Volks get the lesser penalty whereas Riflemen with 2x bazookas get more, yet arguably perform worse.

We don't want a symmetrical game. stop lying to yourselves and learn to play.

Well given the ever increasing chances that make OKW more like Ostheer, I'd say you are wrong, that most people want a symmetrical game, after the honeymoon phase of "cool new and unique factions!" wears off.

As for smoke its applied to multiple vehicles, whereas your only comparable Allied version is UKF doctrinal (which makes them stop), and USF's smoke barrage, which is only for Shermans, and while non-doc, makes them stop moving in order to use. Comparatively, Panzer Tactician is superior because it is a no-fuss ability.

However, OKW would still need some form of hard infantry AT. Maybe a solution to this is to put a Panzerjager 4-man squad which is armed with double shrecks in T2 (or Med truck tier), possibly costing around 250 - 290 MP and the other 2 members are armed with Kars. These shrecks can be replenished if dropped for a cost of muni. This could replace the map-hack HT in the med truck.

People will just rushtech T2 and then blob with your Panzerjagers idea. 290MP isn't a huge cost to 4-man squad, especially if you got like one Volksgrenadier squad nearby to pick up dropped panzerschrecks.
It might fix volksblob, but the result is creating a different blob. It may be even worse as you no longer need T1 queue to get Kubels, trucks and Sturms, you have a separate T2 queue for AT blobs. For better results, you train a mix of PJs and Volks and blob your way to victory.

As for becoming more like Ostheer, it shouldn't be embraced.

In any case few people will bother with a MP40 upgrade, they'll keep the slots and munitions for re-equipping panzerschrecks and dropped LMGs, etc.

Blobbing is discouraged because concentration of force in a fixed predictable location, resulting in easier time wiping it out. I don't blob and retreat when I know the enemy has the means to kill me off as I do so. Which means that 300mp could very well have been for nothing...especially if Mechanized HQ gets destroyed because I opt to fall back to base.

Ideally I would like it available to all factions, EVENLY*, but without massive changing and re-balancing* that is simply not possible, an I highly doubt relic would go through that much effort when it is easier just to remove the skill.

* they would all have be non-doctrinal, and cost/time about even or on-par with their benefits.

**without giving a new unit or ability to halftracks, Soviets and Wermacht would have to make the bunkers retreat-able. and give soviets non-doc forward HQ... or something.. whatever is way unlikely given the glacial pace relic works the balance.

I've tried a mod where Ostheer's doctrinal Field Artillery Officer could use retreat point, effectively becoming the USF major in function. Makes it a lot like OKW when you build bunkers around him, but like Major, hes just three guy squad that can be wiped easily. Obviously restricted to commanders that use him, so you can never get FRP and Tiger for example.
I find the mod very useful when playing large maps like Lorch. It's not an original idea but it certainly makes playing Ostheer on large maps much more bearable, given USF and British's own FRP ability. The author didn't make a Soviet equivalent though.
I think at least from doctrinal side FRP for Ostheer/ Soviets would be interesting. I'd think it would have to be rather common unlock though; however, one can easily look to the least-used Soviet/ Ostheer commanders for a solution, if you add a FRP unlock to these commanders they would prove immensely useful, though at the expense of calling in Tiger or IS-2. But making them doctrinal will also discourage these commanders from being used in matches where FRP is likely not a priority, like the smallest 1v1 maps. But then again if they are added among the useless commanders that's not going to be as big an issue; in small maps I'd still prefer a Tiger or Stormtroopers instead of being able to retreat Pioniers to a nearby bunker.
I don't know how it can be non-doctrinal: putting in a unit like Commissar would make it too similar to USF major, and problematic if he can comes earlier (USF is T4, whereas British/ OKW can be T1, ignoring the upgrade cost) as he's a squad by himself and not an upgrade like Major.
I've seen mods where there is a distinct Luftwaffe Officer squad with his own portrait, but we still have the same problem of being too similar to USF Major etc. Given they have bunkers I'd say Ostheer deserves FRP the least, so making it doctrinal is better option, on top of maintaining asymmetrical design. I suppose bunkers could get a fourth upgrade that precludes the other three, but while the interface makes that possible I think it looks weird to have four upgrade options. Unless you want to upgrade after a previous upgrade, which seems weird, though more balanced as that means more resources and more time spent on an FRP for units you don't have yet and may not afford. Then again, there's Fear Propaganda Artillery that forces units like AT guns to retreat, with no speed or accuracy benefits.

None, who the hell wants less content and variety in the game?

Most players, it seems.