Aluminium is also what you built aircraft out of back in the day, and they could very shiny.

I also don't think it's ersatz anything. It's what you use if you build large, stiff objects that aren't supposed to rust. It's certainly less ersatz than steel, with a less martial character.

So I don't agree. I think it can signify something clean, light, unburdened by heavy and unnecessary things. I don't intend to use it though, for reasons everybody else gives, app-stores etc.