I'm not writing the same stuff. I've written over a thousand different custom applications using the same technology. That was my point. This environment is so tried and true and so effective, it still kicks ass after 28 years. Pretty amazing when you think about how much has changed.

shouldn't there be a work order processing standard solution for aerospace by now?

I'm sure there is. Just like there are blog, website, & CMS standard solutions. And plenty of people using them. I never see them because those people would never call me. Like many other programmers here, I imagine, we only see the customers who need something custom, almost always for good reason.