I'm deliberately avoiding identifying my industry, but this exists in every industry.
I can be flippant and say "we're not making a web shopping cart here" to my people, but the top engineers making Amazon's shopping cart must deal with a lot of complicated problems.
Do I even need to list things? Think of something that's difficult. Nuclear bombs, medical devices, jet engines, skyscrapers, semiconductors, guided missiles. I could go on and on, but I'd still have to explain to you about the more mundane things like operations research.