And then you hand it to someone else, and it gets done.
There are some problems that are just really hard, and some folks just aren’t cut out for those problems.
Problems like "Make X take less than Y time to run" or "Reduce binary size to Z" or "Design a fault tolerant system accomplishing Q" etc are often impossible for most to solve since they simple don't have enough foundations and intuition to solve them. You'd have to spend years drilling fundamentals to get people to that level if they are even capable of gaining the same intuition, most developers never gain those skills no matter how many years of experience they get.
There's also the set of problems that are best learned at universities. Normally, one doesn't have time for a developer to catch up on their missing compilers or cryptography class (this is particularly a problem since perhaps a quarter of programmers have CS degrees, and a quarter of them went to a decent program). If I were asked to debug a clock skew problem on a particular VHDL design, it would take me a long time to learn enough to even approach the problem.