[lsofzz]

> And you can't find typical business rules on Stack Overflow.

Heh. Thanks for raising. I am very well aware of it.

> Getting this right is much harder than it sounds.

Let's call a duck a duck. Unless, you tell me you are designing guidance system for NASA, I'd be happy to leave this pedantic discussion aside.

[mvdtnz]

Try working in highly regulated environments like energy, finance or health. Now make your product work in multiple markets for multiple clients of differing scales with differing needs. Business logic can get very complicated, quickly.