Sometime dead pixels are not a fully on-off affair, so taking a dark frame is really needed, and you don't want to be doing that too often because then the came

Sometime dead pixels are not a fully on-off affair, so taking a dark frame is really needed, and you don't want to be doing that too often because then the camera is not usable then. It sucks, but it is what it is, and it's not too difficult to batch remove dead pixels - if you even notice them.