Comment by gombosg

I started my career as a machine designer (mechanical engineering), designing some machines for FMCG factories.

It wasn't that much different from SWE - mostly looking up catalogs, connecting certain pre-made pieces together with custom parts and lots of testing of the final plan to make sure there are no collisions and every movement is constrained properly.

95% of the time no load or sizing calculations were necessary - we just oversized everything based on tacit knowledge (the greybeards reviewing the plans) since these machines were not mass produced and choosing somewhat bigger parts was not expensive given that these machines would operate and produce value 24/7 for years.

(I hope the analogy to software engineering is visible!)

What I'm saying is that the level of "engineering rigor" heavily depends on the field where engineers are operating within. Even certain SWE fields (healthcare, finance, aviation etc.) have more regulation and require more rigor than others.