And the 38mm at the field can land 276 hits all over the osti or wirb from 600 meters and it drives off undamaged.
1. Field auto guns are adjustable in lethality for gameplay purposes. and did you really count out 276 hits?

2. Do you understand that the Osi or wirb has --->NO ROOF<---
3. Do you understand that that a field gun firing an essentially flat trajectory will hit the armored sides of the vehicle?
4. An airplane diving in can shoot the top of the turret, which does not have armor due to there being --->NO ROOF<---
5. Take a Wirbl for example, Lets see, a quick check of the armor tables shows...oh my, 80mm of frontal hull armor, 16mm for the turret that also has --->NO ROOF<--- and a whopping 11mm on the hull top.
Hmm....where would I want to shoot this thing? The the hull top that has at best 11mm, or the sides that range from 20mm(rear) 30mm(sides) or 80mm(front)
In simple terms, bullets go through thinner things better than thicker things, the top is thinner than the sides
