In the most recent update the penetration distances were changed from 10m, 100m, 500m, 1000m, 1500m, and 2000m, to 100m, 1000m, 2000m, 3000m, 4000m, and 5000m.
This is the Bt-5s APHE statcard for example.
What was the reasoning behind these changes? It isn’t possible to fight a tank from 5km away on any map.