It depends on your face as much as it does on the binocular. For me, indeed I don't see the full FOV if eyecups are full out. On my Leica, I have them only 2-3 mm out. Even on bins with very long eye relieve (e.g. Zeiss SF), I need a position somewhere half in. So for me, the recommendations of this blog apply.
But then, I think it's kind of a non-issue. Doesn't anyone (except complete binocular dummies) know that you need to find your own optimum position of the eyecups?