I'm pretty questionable of Arms. Like the potential is there. Set bonuses and some Legendaries will still be good for Arms. It's still plagued by RNG, and in my opinion is much less versatile than Fury.
Will Arms be good? Sure, I think so. But I'm doubtful of it's ability to keep up with Fury in a vast majority of situations.
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I'm just a few days shy of two months at max level and haven't gotten one yet. I've averaged probably just under 1 dungeon per day, and I've done my daily emissary the entire time. So definitely not going hard, but the Legendary RNG is by far my biggest worry of this expansion. They seem to take a long time to get, and half of them are trash on top of that.