So you just presume I'm exaggerating? On the basis of what exactly?

There is nothing robust about mountains of spaghetti code. If anything these businesses are spending countless dollars paying the interest on the technical debt left here. What's worse is it impacts their long term competitiveness as it resists even incremental improvements. Besides, there is nothing fancy about basic practices like solid design, proper planning or even just the appropriate use of tools for source control and build processes.