Is there an incentive to delete variables / array values / other stored items?

Question

I am working on an application where my storage will grow and grow. I could delete data as I go, but I dont see any incentive to do so. Is there something I'm overlooking?

Specifically talking about arrays, enumerableSets, and mappings

Answer 1

Deleting items with the delete keyword gives a gas refund, so there is a good incentive to do memory cleanup.

Relevant posts:

Delete or clear a mapping

Delete an entry in a mapping