"Rangers have no downside" means "hey dude, use metal weapon all you want". You may argue all you want that "it is not downside compared to others", but truth is - savage using metal weapons is handicapped.

I have lost a couple of ultra sexy kills as Gromm (including ambushes on convulsing Provost and Captain) when I was following the "no downside" logic.

So unless you include all that tricky explanation in a newbie channel answer, saying "savage is not handicapped by using metal weapons" is deceptive, which is proven by the fact that this question popped up here and you had to post 10 line explanation of how it is so.

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Newbie friendly answer would've been "Savages lose their ambush onslaught bonus when using metal weapons".

Edit: It is also nice to hear "Rule of thumb - don't use any metal if you're savage", which is fairly often an answer there (and is explicitly stated in helpfile as well).