The problem space (Business) is not complex, its incredibly simple. Unfortunately the design patterns we use and the tooling is flawed. It has been this way for at least 25 years and the RDBMS, languages, design patterns, and architectures ( 2-tier/ 3-tier) are the cause.

They make it simple to get started and even without knowing what you are doing you can easily churn out something that works if it is simple, doesn't change often, doesn't need to scale and deals with small amounts of data.

But similar to http://blogs.tedneward.com/post/the-vietnam-of-computer-scie...

"It represents a quagmire which starts well, gets more complicated as time passes, and before long entraps its users in a commitment that has no clear demarcation point, no clear win conditions, and no clear exit strategy."

RDBMS are the root cause.