Why not separate out the Leopard2 PSO's mine protection to a modification

Machinery of War Discussion Ground Vehicle
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here the issue report’s link,
Leopard2 PSO 's mine protection shounld be a modification // Gaijin.net // Issues
if it separate this out,the leopard weight can reduce 2.4tons! why developer don’t separate the mine protection to a modification just like the Strv122B plss or the new leopard2 A7V one?

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Tried to do it in ru forum. Passed to developers in the end…