But low-level C++ optimisation _is_ straightforward, if you're familiar with the CPU architecture. The issue is that most of the people don't want to deal with

But low-level C++ optimisation _is_ straightforward, if you're familiar with the CPU architecture. The issue is that most of the people don't want to deal with it since it's one of those areas which is not easily transferable to other domains. It is the highly-technical BS. Just like saying high-frequency trading is an enterprise that requires incredibly smart people. No - it doesn't. It requires loads of niche knowledge that you can't apply anywhere else.