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There's a simple way to have it both ways: adapt the map to different difficulty levels. Luckily, I've been doing this since my very first map. One version is for those who want to test their skills, while the other is for those who don't want to take risks. Or, like you: first, explore the map with a Barbarian, and then, with that knowledge, tackle it with a Knight. That's also a great strategy. Besides, I want the map to be enjoyable for me too, and I don't like easy walks.
By the way, maps designed for complex global challenges, like waging war on multiple fronts simultaneously, seem more challenging to me than just relying on brute force and stats.