You say that you have no idea what the developers believe, and yet you are going to try and insinuate several times in your argument below that the designers didn't believe that these abilities are appropriate for the fighter. But both times you tell us that the designers didn't think that these were appropriate, you also say that you think that these abilities are supernatural, which further insinuates that you believe this to be the reason why. That sort of argument strikes me as double-speak or at least talking out of both sides of your mouth, regardless of whether you intended it that way or not.
You mean apart from the extraordinary abilities in the non-magical Battlemaster and the Purple Dragon Knight subclasses? I know you consider these abilities magical but I don't really care since the game does not consider them magical abilities.