This is a fantastic example, and it applies to just about everything in life. That which we only use or see is simple. That which we build, is not. Until you

This is a fantastic example, and it applies to just about everything in life. That which we only use or see is simple. That which we build, is not. Until you've had a custom home built, for example, you may think a home is a pretty simple thing. Likewise, until you've built any non-trivial piece of software, you might think it simple. I suppose it's a human optimization to conceptualize and minimize things in our mind. It allows us to have enough of an idea to get on with whatever is more important to us. The problem is when we forget that we are naturally oversimplifying everything in life (except that one or two things we're actually doing/building).