Who judges merit?
How do they judge it?
By using, or not using, code.
Is it a fair judgement?
It is the only judgement that matters, whether it is "fair" or not.
What about all the biases that everyone has?
No one gives a crap about the gender of the person that wrote the code. When I submit a patch to an open source project, no one asks me about my gender. It is irrelevant, and often unknown.