Dyson’s taking another crack at the robot vacuum market in the US following the failure of the Dyson 360 Eye — which it launched in 2016 and then quickly stopped selling here, saying it was “ill-suited to US homes.” (The follow-up model, the 360 Heurist, never made it here at all.) Now, Dyson is introducing the Dyson 360 Vis Nav robot vacuum. Shor...