Even though it lost resistances to Dark and Ghost, it still resists a bunch of types, including Dragon and--you guessed it--Fairy. Considering Fairy's obvious and understandable rise to prominence, Steel's gonna be heavily relied on once again as that ultimate defensive type as well as a check to most Fairy types.
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Like pointed out before, Xerneas, Klefki, Togekiss, Mawile, and Azumarill are the only Fairies doing well. Anything with Xerneas' stats will dominate. Togekiss has flinchhax. Its type combination doesn't really matter that much. Klefki and Mawile wouldn't be doing nearly as well without Steel. The only one that's really great because of being Fairy is Azumarill.
Steel, on the other hand, is still a good type. A lot of Steel types are made good BECAUSE of their Steel typing. Steel gets my vote.
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