Just out of curiosity, what do you mean when you say many/most candidates on the market are poor developers? Seems crazy that a majority of people applying for any position lack the requisite ability to actually fufull the positions requirements.
And yes, I agree, it seems crazy. But it's our reality and seems validated by others I know in the industry and anecdotes here on HN.
There is just so much demand, it pulls people into the industry that can't really perform as professional developers.
I think the frustrating reality is that it's usually not possible to tell the good from the bad at the portfolio/resume level, some kind of skills/competency test must be given.
I personally don't look at GitHub repos because I don't know how long it took to write that code. If it's great code, but took 4x to write than it should have, I wouldn't know. There are also a lot of applicants that just don't have much public in GH.
Finally, to be clear, I'm not saying they are all bad actors. I'm sure some are and the same for employers. Mostly a result of the current world economics.