This articulates some of the concerns I had trying copilot.

I noticed that I ended up assuming the code reviewer role when I was trying to write code. Context switching between writing and reviewing felt unnatural.

I also think I am less likely to spot a bug than I am to avoid writing it in the first place. Taking the off-by-one error in the last example. I don't think I would have made that mistake, but if copilot had presented that code block, I probably wouldn't have noticed the error either.