> More lines of code usually indicates more bugs so its not an entirely useless metric.

This is conventional wisdom, but it still feels dubious.

Often I see additional lines of code added to remove a bug, without adding a bug. So comparing the before and after more lines means less bugs.

On the flip side it often indicates more capability, which is more lines, more bugs, more complexity, but also a very unfair comparison.

I am not completely sure what I am getting at here; but, it seems like there are alot of confounding factors.