Scars Unseen
Hero
Perhaps you can't, but it seems presumptuous to say that the people using a word must mean the least charitable interpretation when there's no evidence that's the intent. Considering the entire discussion is about a comparison of earthly might versus otherworldly power, the usage of the word "mundane" should be taken in that context as the literal "of the earth" definition.You can’t separate those to meanings in choosing the word mundane.
More specifically, the discussion seems mostly to be about finding the line between the mundane and the supernatural, how far that line can be pushed before it breaks credulity, and whether or not it's a bad thing when it does. Obviously people have varying opinions on each of those discussion points, but at the very least there seems to be a general agreement that the current balance between classes that lean on the supernatural and those that cleave to the mundane is off at higher levels of play, and that something should be done to address that.
Personally, I feel that the line drawn depends on the fiction you're trying to emulate, but D&D has problems emulating any specific kind of fiction, especially since different classes seem to be designed with different fictions in mind. I think D&D would be better as a game if it targeted specific fictional goals and then put out material to support that, with a somewhat more malleable baseline to start with.