If you find a key somewhere in the ground, will you pick it up? As you don’t know what lock it fits it, you will most likely hesitate or even ignore it.
The important of key is to know which lock will it unlocks. Without knowing the target to unlock, the key is of no use. So, it makes less sense when you find something or some knowledge or ideas, but don’t know where to utilize it.
The real benefit happen when you have the key and you have the lock that the same key can unlock.