Last season the NBA leaned in on teams resting players, particularly in high-profile, televised games. The NBA built in rest before those games to help, and teams mostly played along, but players who teams wanted to be cautious with still got their rest. That is not changing now, NBA teams have science to back it up.
Neither of these should be a surprise. Both Hayward and Leonard are coming off injuries that cost them a season and both are clearly feeling their way back into this season (Leonard seems ahead of Hayward on that front so far). Both Toronto and Boston have their eyes on May and June, there is no reason to push a player and risk injury in October that could be a much more significant setback.
It will be interesting to see how the Timberwolves come out against Dallas without Butler, who is their spark plug. Andrew Wiggins and Karl-Anthony Towns should step up and have big nights to lead the team, this is a game Minnesota should still will, but how will they respond on a back-to-back? Something to watch.