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there's one exploit on the map... the Golden Vein chain (where the ambush is). You can infinitely level up by repeatedly triggering the ambush, running back and forth (although 800 experience points on a level 19 hero is just a drop in the ocean). It was interesting, but it felt a bit empty.

But why set a development limit?

You need to ask the developers (Nival Interactive) about that.
It was also present in the company.
P.S. Are you talking about the level cap of 40?