To be fair, it’s a hard optimization problem. If you are trying to remove bias from your hiring process then it is difficult to objectively score things like OSS contributions. (I do agree it’s something most bigcorps could do better.)
As a small company you don’t need to try to remove bias with objective metrics (indeed, “culture fit” and “thinks like me” can be good heuristics for building a small tight-knit and high-performing team) but when you hit the company size where you must introduce multiple layers of management, then fully trusting each line manager’s subjective judgements can lead to very disparate quality and other political/organizational issues.
As a small company you don’t need to try to remove bias with objective metrics (indeed, “culture fit” and “thinks like me” can be good heuristics for building a small tight-knit and high-performing team) but when you hit the company size where you must introduce multiple layers of management, then fully trusting each line manager’s subjective judgements can lead to very disparate quality and other political/organizational issues.