I think maybe Tightrope made a video on it. Not 100% sure. Either way, I've been including it in my 4v4 loadout along with the bulletin that makes it build 50% faster. The only actually impactful bulletin in the game lmao.
Best thing about the Pak43 is you can smash superfluous new assholes into enemy tanks then willfully deconstruct it for a return of 150mp and 15 fuel, effectively a 200mp and 30 fuel counter to all tanks.
EDIT: oh and with 2 engineers and that bulletin, you can build it in about 20 seconds or so. Good for suprise attacks.
EDIT 2: to begin deconstruction it needs to be out of combat for like 15 seconds or something, but once you begin it can't be stopped unless the gun is decrewed.
Gotta love the bulletin that lets you build Pak40s AND Pak43s 50% faster lol.
In team games I have had some insane luck with Pz4s and Pak43s.
Although if I'm honest it does feel like Joint operations and Fortifications doctrines almost have too much utility. Gets boring seeing 1 or 2 of them at least every game.