Jebus Cross

With the dungeon, the map template often loses its clear structure, and the battles may become less dynamic than without the underground passages due to larger spawn areas.

Perhaps, but it still doesn't hurt to test it out. In the treasure chamber, sometimes you need to break through a dozen blocks to reach something, guarding unnecessary prisons where heroes of level 30 or something else are held, and troops are lost, and mana is also depleted...
I'll emphasize again: the treasure chamber is ALWAYS covered in sand! Therefore, pathfinding won't be superfluous.