I don't understand this attitude, if something is incredibly complex and very hard to get right, this can indicate that there is a mismatch between the tools yo

I don't understand this attitude, if something is incredibly complex and very hard to get right, this can indicate that there is a mismatch between the tools you use to implement it and what you should use. With the right language it might be much more pleasant to implement: Consider for example https://github.com/GaloisInc/halfs https://github.com/GaloisInc/halfs a filesystem implemented in Haskell, I think it has ~10000loc It can also mean that existing implementations are poorly documented and research papers on the subject place no importance on implementation details. Of course you should not use your first implementation in production, but that is as obvious as not letting someone do brain surgery who has no prior training in it.