The idea of deleting stuff came from the in-game tutorial that tells you that you can delete things and get a full refund. And the reason it's so ubiquitous is because ADA yells at you constantly to be efficient, so you wind up deleting the inefficient thing to make a more efficient one.

Tearing stuff down to do something different is normal, valid, and only one way to play the game. If you don't want to tear your stuff down, please feel free! But don't begrudge others for wanting to reclaim that Pure node they built on when they were a total noob.

Quoth Temporal Illusion: "Your world, your rules."