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Response to the comments above:
1) If you look closely, you can see that each location has "settlements" with their own streets, zones (cemetery, market), and areas, and in each settlement, you can feel the presence of intelligence (hence the apparent rectangularity of the map). Similarly, "forest paths" (mountain, desert, etc.) are where nature takes over, and symmetry is impossible.
2) It is assumed that the clash with another player will begin after 1-2 locations are closed, so it is not necessary to collect everything on the map.
Many resources are purely decorative.
Others force the player to make a choice: "collect them all or spend movement points?"
3) To invade another player before a certain point, you will have to exhaust your army quite a bit, which gives the lagging player time to regain the advantage.
3) It slows down on weak computers; this is a feature of Heroes 5; it cannot handle large maps. What can you do?
4) Necropolis is not the strongest faction; the strongest here is Dungeon. They will easily defeat a Necropolis army that is many times larger (if, of course, you know how to play).
5) Overall, there are many opportunities on the map to win with any faction (I usually play Orcs against Necropolis).
Thank you for your comments; I will try to make the maps better