I think programmers in general do not give much thought to the level of engineering required for a task.

Mostly, there's too little, but there are many cases when there's too much. I see people writing tons of tests for corporate software that will be used by a couple of people and will have to be updated regularly anyway.

Building a hut is not the same as building a skyscraper, but we don't really have guidelines for different software projects. No methodology I've ever seen distinguishes types of projects by complexity.