In 2018.1 there's an explicit Model Assist mode to bring back this behavior when no SGs are assigned, but I don't think it's in the latest 2017 update.
If there are no smoothing groups, it behaves the same way in regular shaded mode. Yes, I use D3D 11 (on GTX 1060 so no prehistoric gfx card either). There were quite a few threads about this at the time of 2017 release which I think is also part of the reason why Model Assist was introduced in the first place (there seem to be no other differences from shaded mode apart from this).
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