In the physical world everything is expensive. If you don't have a lot of money, you have to prioritize between eating out at restaurants, going on vacation, fixing the car, shopping, saving for retirement, and other costs of living. You can't do everything.
In the virtual world everything is free, like tap water. It's hard to build software systems if you feel guilty consuming virtual resources.
Imagine how you would feel writing code if you were a billionaire. You would take whatever you need without hesitation. You would never slow down to optimize the inconsequential.
Virtual resources are free, like tap water. You have GBs of memory, GBs of storage, GHz of compute. In the virtual world you're a billionaire. So code like one.