Looking across the league, there simply aren't too many better benches out there. Chicago, Dallas, Denver, Detroit, Miami, Minnesota, Oklahoma City, San Antonio and maybe Orlando and Philadelphia and Utah are the only real deep squads.
Right away, Denver, Detroit, Minnesota, Philly and Utah are not exactly contenders, and just suffer from the disease of having a whole lot of decent players and not enough truly good ones. Orlando and San Antonio are teetering close to the edge of ending up on the list of non-contenders as well, due to a lack of quality starters.
So, if you were to tell me that Chicago, Dallas, Miami and Oklahoma City were the only contenders that I would argue look as strong or stronger than Boston from a depth perspective when the off-season started, I'd be pretty okay with that.