This is because it hasn’t been revisited since it was implemented as part of the first tranche of ATGM equipt vehicles.
And it is apparent that its for those that have an unmanned turret.
The M3 and M3A3 do, its a weird group of vehicles that do, the criteria is probably something to do with Unmanned turrets and / or NLOS capabilities , which the SPIKE currently lack (may be receiving MITL in the next patch).
This most likely, given bmpt also has sort of unmanned combat module (but belts make its safety bit questionable) and its atgms used to just burn similar to spike carriers.
30mms in a belt don’t chain react like that. The explosion is usually very self-contained, especially if it’s a single strip of ammunition versus 30mm that’s bunched up together
What I’ve seen is you either get spammed with a ton of atgms cause of this or you remain hull down in all the maps and spray. BMPT is brainless to use, can’t hold W on uptier but you can get every single barrel with low stress hold F with an ammo box and keep spraying.
Lastly, you have a gooner skin so the respect is as low as it can get
You really love me that much don’t you, even if it means babbling random stuff, as long as you get to talk to me, it makes you feel accomplished. Cute.
I don’t know a whole lot of explosive logic, and I don’t think that in War Thunder that’s exactly realistic, but I still try to understand if the belt of (for example 140g of propellant charge in the 3UBR8, APDS-T) ammo is enough to create a chain reaction strong enough to disable the vehicle, as destroying the vehicle is pretty unrealistic. This question alone not only would open question about if this is realistic in the Terminators but also in most of other vehicles with similar design. Personally I think is a in-game decision given that the BMPT on release was ‘missing’ this weakness that other vehicles alike has.