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Honestly, I see people having such a sentimental attachment to these "hidden spots," but they only give a small number of troops.

Especially if you're playing as Dungeon and have a portal. And hidden spots can be different. A hidden spot with Wyverns is useless, but a hidden spot with Hydras or even Gorgons is great!
Of course, an Elven hidden spot in week 4 isn't really worth much in terms of troops. But in week 1, this hidden spot can help you develop a fast pace and win the game. It's just that sometimes games end in week 2...