When I first bought the Hatch Chiles I did a little research, and somewhere I saw
that leaving the blistered skin on,keeps the flavor in and the skin protects the pepper flesh. It takes so little time to fun the frozen pepper under cool water and the skin just sort of lifts up and you just peel it off, it takes just a few seconds to remove it. Leaving it for a few minutes longer, you can simply pull the stem out with all the seeds attached. The few that remain are minimal. You can always swipe them away with your fingers.