“Just to note (for Yomim Tovim at least), if your oven has a pilot light (as opposed to an electric ignition), R’ Shachter holds that you can shut the oven or burner completely, because the flame isn’t being extinguished. It’s only being shrunk back down to the pilot. In such a case, for safety purposes, you should shut the burner whenever you’re not using it. “
When you ignite a stove from its pilot flame, there are two separate unconnected flames created. If R’ Shachter holds that you can shut the oven or burner completely, you are extinguishibg one of the flames totally. It seems to me that R’ Shachter may be using the s’vara that Rav Moshe used for his chidush.
Feif Un, in which sefer did you see R’ Shachter’s shita?