Any time I play without master scout I notice the damn AI heroes looting lairs that I have cleared. As there is no way to clear and loot a bear lair in one turn without master scouts, it gets really annoying. In my last game, I jumped Ceresa as an Empire just because of this.
Keep it in the game, it's awesome.
What's less awesome is that when the AI is headed for a lootable tile, positioning an non-hero unit on top of the tile does not always prevent the AI from looting it. The AI does not seem to always recalculate its path, and will happily stack with a neutral player unit to grab a item.