The problem is that it’s not realistic.
There’s no way that some WW2 SPAAG would be able to first-strike hit a plane flying at 1.5 km altitude over 400-500 km/h.
If it was actually spraying towards you and walking its shots in? That’d be fine and perfect.
That’s what battlefield SPAAG do. If you try to CAS the battlefield tanks and SPAAGs, you’ll notice they start spraying bullets in your direction with increasing accuracy the longer you linger and keep flying in a straight line. If you engage in rapid maneuvering, they’ll still struggle to hit you but if you go for a head-on strafe or extend away in a straight line - they have a pretty good chance of hitting you.
Especially things like gepards in the korean jet tier. In the korean jet tier, I found for CASing I’m best off diving in at a high, near supersonic speed then fire off my rocket pods/drop my bombs and immedieately disengage while weaving through the air like a snake to avoid the gepard’s shots and thus, they barely whiz by me. If I approach gepards like I do ostwinds, I get shot out of the sky because if you linger after your bomb drop, they’ll get a shot at you which is perfect and sensible.
The problem, once more, is that the convoy A.I is not like those gepards. It hits you immediately without walking its shots from a mobile platform (this is probably the craziest part - have you tried to use an ostwind to shoot planes while moving?) just because you flew near them under ~1.5 km altitude regardless of your speed or time spent loitering. You die regardless or get severely damaged.
Your mention of using ATGMs and targetting pods and all that is what the usual consensus seems to be from what I read: Until you’re flying such a jet - avoid convoys like they’re death incarnate.
I imagine the issue is probably from the lack of BR scaling of their accuracy/effectiveness. A modern radar SPAAG will be able to hit you with its first shot and likely have stabilizers and whatnot to do it while moving as part of a convoy. An ostwind won’t - unless you’re doing a head-on suicide charge or stalled out over it.
At least with WW2 airfields, one can imagine they employ flak boxes to completely deny an airspace and hit you by virtue of sheer saturation.
When that convoy SPAA one-hit me at the A point, I was flying around 1.5 km-2.0 km altitude in cloudy skies in a sabre at ~8-900 km/h while circling and changing my flight path quite regularly. I saw no missed shots.