[rileymat2]

One last thing to consider, if you are writing little a CRUD app, it can be very simple, you can keep it in your head.

However, Can you?

You are using black box code from a web server, a sql database, the operating system, crypto libraries, and a ton more; You don't dive into that source code except in extraordinary circumstances, if you even can. In a large program, you end up treating code owned by you or your company as the same way.

In this scenario you are still making large meaningful changes by focusing on the level of abstraction you are at.