Is smite while unencumbered working as intended ?

I think not, because it only attacks with main hand and doesn't alternate (looking at the animation). I tested with weapons because there is no info about dual-wielding with smite and it alternates. Can someone from GGG confirm if this is intended or not, is the DPS calculated properly then ?

no one ? :(

I honestly can't say since only GGG would know. Tested it myself and it indeed doesn't alternate hands while attacking, so I don't know for sure if it's counting each hands damage separately or not.