Take look at the yag 10. Its a tank destroyer with a long 76mm gun. Its a hard to manage unconvinient truck with zero armour. Its gun (suposedly a tank destroyer) has 121mm of penetration, and aced crew reloads it in 5 seconds. Now compare it to panzer 4 f2. Its 75mm gun has 137mm of penetration, it has not bad armour, its gun is reloaded at 5.9 seconds at ace, and its overall a good viehicle. Both of these viehicles are at 3.3 BR, same br. This is quite absurd, german tank destroyers at 3.0 have 151 mm of pen with same reload. Now compare it to the marder 3, marder 3 has more armour, same calibre 76 mm gun, same reload 141 mm of pen, and is at 2.3. 1 br lower than the yag 10. what the hell is that. Really
two words, soviet angle penetration, and explosive filler
It’s probably the “mobility” causing issues. It would be the same reason the Breda 501 went up from 4.7 even though it doesn’t make sense.