Speaking of Larian hiding a sword of infinite power in a random barrel just for lolz, did you know they kinda did that with a stool at the top of the Arcane Tower? You break the stool and get a club that automatically increases your strength to 19. (Club of Hill Giant Strength.) Seriously, pretty crazy. So you really DO have to check every nook and cranny for the good stuff!
I would think this an example of how we want video game studios to place cool secrets in the game.
The name is a hint that the stool is special, so it rewards exploration and experimentation.
Searching the environment is what should be encouraged, and that’s very different from looking in every crate and barrel even though it’s obvious nothing will be in those aside from the trash that is always in those.