I think you are misreading this question. It is a merit of the organization and I think gets at the issue of lots of organizations using OSS, but very few of them actually contributing back. What this requires of the organization is to acknowledge that they need to contribute if they want to benefit long term and thus they need to allow and encourage their engineers to participate.

If employers were encouraging or at least allowed it you'd see a lot more great developers have this merit, but for most medium to large organizations it's a one way street with OSS and prohibit their engineers from open sourcing projects or contributing to projects the organization depends on.

I know way more great developers who contribute to open source than great developers that don't.

Of course you do, they publicize themselves by contributing to open source...