Playing on L-shaped maps.

But aren't you tired of doing the same thing over and over?

I'll note that in chess, the moves are also quite monotonous – a pawn only moves straight, and a knight moves in an "L" shape. However, people still play this simple game for some reason.
We play online, and we enjoy it. I'm not asking you if you'll take 4 angels on level 121 in a castle, or a maxed-out Utopia on level 131. And I don't consider that the pinnacle of skill; I just feel satisfaction when I succeed. But according to you, completing a mission is the limit of human genius.
Of course, fighting a human in the final stage is more interesting than fighting monsters, but you still need to prepare for the final stage. So, you have to quickly rush through the dwarf/swamp areas. And these movements are not as monotonous as you think. In the last game, I somehow managed to win by exchanging a third of my skeletons for a fire spell in the treasure room. I didn't have much meat or magic, I just killed everyone with a berserker. It was worth rushing through for such a final stage. :)

P.S. An advertisement looks much more convincing when you understand what it's about. "Mission 3" means absolutely nothing to me