Idiomatic is not necessarily better. "Idiomatic" C code of the eighties would be considered atrocious now.

And idiomatic Java code (Factory of proxies of singletons) is laughed at.

And not a lot of people are fond of idiomatic Ruby code, which tends to rely on "magic" (or "action at a distance").

Sometimes idiomatic is good, sometimes it's bad. Let's not cargo cult.