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It's not without reason that no one has made a mod to enhance the siege weapons since the game was released because people understand that it would be absurd.
I don’t think enhancing siege weapons is such an absurd idea. After all, we are not talking about increasing the attack of ballistae or adding extra shots for catapults; we are talking about simpler things:
1) Ballista – add some HP (30%)
2) Catapult – add some HP (30%)
3) Tent – add 1-2 shots (no more)
4) Cart – add some HP (30%)
In general, even on this forum, discussions about siege weapons have been ongoing since 2006. Many forum members offer their ideas and developments.
/topic/1564/
/topic/688/
Perhaps there just hasn't been an experienced modder who could create such a mod, but I think it's only a matter of time; sooner or later someone will create such a mod.