I do state that nobody writes code like that. The point was the language supports all these ways of coding and never states an opinion on what should be prefere

I do state that nobody writes code like that. The point was the language supports all these ways of coding and never states an opinion on what should be prefered. Maybe there is a style implied by Odersky's Scala course, but I'm not sure even that style is considered the in fashion style these days. Somebody needs to write these things down. People can ignore them, but at least deviation would be explicit. See my diagram with the arrows.