I always see this point mentioned in "App VS Spreadsheet" but no one gives a concrete example. The whole point of using a "purpose" build app is to give some structure and consistency to the problem. If people are replicating spreadsheet feature then they needed "excel" to begin with since that is a purpose built tool for generalizing a lot of problems. It's like I can say well my notebook and pen is already in front of me, I can use this why would I ever bother opening an app? well because the app provides some additional value.