As I am now using a mac for to see where my Mac users (at home) have
their problems I am questioning myself what people, with a good
knowledge of IT like on those machines?

I personally find nothing, which these things can do better than
Windows or Linux. Even the graphics interface is nothing special. And
if it comes to any customization I am forced to the limited
possibilities this OS offers. And much things like e.g. setting
persistent routes are only doable in clumsy workarounds.

So I am really questioning, what advantages those machines have -
except of marketing driven prestige??
W. Prindl