So I came to conclusion one compromise is using soft reflections of lightsources, or rather, soft falloff cast onto a reflecting surface. Imagine a translucent dome for example surrounded by arealights which create this gradual lighting which you can control by altering distance of lights. This approach maintains black areas needed to show it's metal. But this kind of steals showing the metal material quality (mirror-like). I.e. it shapes the form well, but it's not too obvious if it's a mirror-like surface or glossy.
The question is, if you encounter a complex mirror-like subject to light, and lighting it with crisp transition edges fails (breaks the form), should you just play safe, lighting it with soft transitions or there's a better solution? Or, in another words, is it OK going for glossy-like look (like your glossiness parameter is not high in reflections) for mirror-like materials by doing very soft reflection transitions?