[WJW]

That kind of engineering is surely done for "big" projects but I'm pretty sure my contractor didn't do any FEA modeling when he put up my shed. He knows from experience that normal wooden beams and some steel bolts will be fine.

I think part of the problem is that most of our "raw materials" like nginx and postgres are so robust that you can build really quite large projects without having to do any modeling or other big planning. Things that have millions of users can still be more-or-less slapped together from default parts.