If by softer you mean, that the NHLers could not hit a soviet star because he was too slick on the skates for them, then yes.
That myth coming from a Bruins fan is not surprising though. Big bad Bruins and all, right? That is why I never was a fan of the Bruins.
Less games, way more practice. Or do you think that superior soviet hockey came from sitting around, staring at the walls? Every foreigner who played in the KHL to this day know how much tougher russian pre-season conditioning is. And that is nothing compared to what it was like back in the day. They sure did not went through a 82 games regular season grind. That does not mean it was in any way easier for them.