I would agree. Clearly ice can accumulate anywhere, and if I think about how quickly ice can form on a flat, heated windscreen, then I dont want to think how fast it can collect on the tail of my 737. But surprisingly I've never seen large accumulations of ice on the tail after landing (after an approach in severe icing conditions), not much more than a light coat of rime ice on the leading edge without any noticable change in handling characteristics.
Something I recently read - Airbus chose to equip the mighty A380 with wing anti-ice, but actually the only part of the wing that is heated is the number four slat on each wing, nothing more. Is the airfoil designed in such a way that ice either has great difficulty in forming or that it can just take a lot of ice on the leading edge? Seems half-hearted to me, a bit like the 737-NG WAI where the outermost slat isn't anti-iced (just more extreme)....