Just guessing, but I wonder if this has something to do with the physics of heating something from the inside vs the outside—perhaps to get to a high enough deep internal temperature in a heat bath either takes too long or requires such a high temperature as to hurt the skin and outer body.
Just guessing, but I wonder if this has something to do with the physics of heating something from the inside vs the outside—perhaps to get to a high enough deep internal temperature in a heat bath either takes too long or requires such a high temperature as to hurt the skin and outer body.