You can leave them unlearned but the game will keep occupying the slots on level-ups so if you don't want to take them you'll be having less to pick from on level-ups. And by the way, the rock wall is extremely good in some situations. Sure, it has 100 hp on level 1 but it'll still take one hit from even a huge walker stack giving you one more round before it can reach your ranged units.
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