I'm certainly comfortable with sitting players when the time is right but I've never been able to grasp the notion of 'the regular season is meaningless anyway.'
It's certainly not imperative to fight for the W in every single game - after all 82 games is a heck of a lot of basketball - but no NBA team wins a championship on the back of a disregarded season that eventuates into a dominating playoff and finals stretch. The regular season is and should always be utilized as a platform to build team chemistry, understand the sets as naturally as the concept of breathing air and to build enough confidence as a team to be able to get the job done in the long run.
And especially for a new team like ours, it's going to take at the very least 82 games to get anywhere near the level of some championship-ready teams that have been playing together systematically for years now.
So yes, it's fine to rest players and keep them fresh for the post-season ala Pop, but no, the regular season is not meaningless. In fact, the regular season is the building ground that decides whether or not an NBA team will be meaningful when it comes to show their stuff in the playoffs.