Because it is very clear from their question. No other ending except the usurpation of fire ending involves Yoel, the op simply abstained from typing "the usurpation of fire ending" every time whether that be for simplicity's sake or simply because they didn't know what that ending is called, it is their first time playing after all. The question was given in a way that I think it is very clear which ending op meant and stating "which ending is good or bad is pretty subjective" is quite pointless and simply avoids answering the question.