The X300 Ultra is mostly let down by its rather dull design. A few months ago, I wrote that the telephoto camera is the only lens that matters any more, at least when it comes to Ultra-class flagships. As phones got better, cameras became where manufacturers tried to stand out. As cameras got better, telephoto lenses became the next point of focus. The most recent Ultra phones from Xiaomi, Oppo, and Huawei have all made the telephoto, above all, their selling point. Vivo's X300 Ultra is doing