[MiddTech]

Lack of a robust and universally available/adopted mechanism for sharing, standardising and utilising said wheels. In addition, an ecosystem and/or culture that supports such a universal standardisation.

This is assuming that standardisation is even the answer, i can state subjectively that there is no currently acceptable universally applicable method for implementing authentication/authorisation; and that's just one example.

There are auth standards, sure, even good ones, but implementing said standards across the entire galaxy of development environments,architectures and business limitations. Good luck with that, i really mean it, solve this and you'll never have to work again.

No github doesn't count, it's not universally accesible, nor is it viable for some Even if it did, it's still only the availability part.

TL;DR; shit is complicated. https://xkcd.com/927/