In reference to the discussion about shuting off the burner or oven completely on yom tov- i think we had this discussion,in great detail ,last summer, in this ‘coffee room”- and it is not so “poshut” that it is not “mechabeh”. I can’t find the thread now but someone else may.
as far as the ‘godol’making kiddush and eating on yom kippur, thid story is said about r” Ysroel Salanter when there was some kind of epidemic that endangenred people if you did not eat.