No, not lazy; why they do not have motors and blocks ready when needed by Ski-Doo hurts it's business.
Leftover 850's, possibly the clutching improvements needed that were partially made in the 2018 model by improving the belt and belt shield cooling. For 19 Ski-Doo will go even further and put cooling fins on the clutches further reducing heat for the MTN guys and hard riders, this could lead Ski-Doo to want to put any concerns of that behind them. For me, a rider that rides aggressive but rarely sees over 92 MPH I never had issues with my 17 or 18 850 Renegade and just rode, gassed and oiled and adjusted the belt and was immensely pleased by the sled.
Based on my research there are only a few left and those who buy what is left today will enjoy the fruits of the rebates in future years in resale.
It's like the old saying; "buy when others are selling and sell when others are buying".
Bear