I get why LeBron is frustrated. He's 32, he knows he needs to conserve as much energy as possible for the postseason, yet he's logging the most minutes per game in the NBA for a team that, despite winning the le last year, looks absolutely helpless whenever he isn't on the floor.
At the same time the reality is that the organization has done just about everything he wanted in terms of this roster and the coaching staff. He wanted Kevin Love for Andrew Wiggins, he wanted J.R. Smith and Iman Shumpert, he wanted guys like Mike Miller, James Jones and Chris Anderson, he wanted David Blatt out and Ty Lue in... they've given him just about everything he's wanted. And look, I like Matthew Dellavadova as a player and I wish the Cavaliers still had him, but there's no way he should be the missing piece to the puzzle.
In addition to being frustrated LeBron might just be a little bit bored right now. It's the dog days of the season, the regular season is really a gloried exhibition season for this team and LeBron kind of has a need for drama anyway. There has been some sort of drama at about this time of year for the Cavaliers every year since LeBron has come back. It's annoying but it goes with the territory with LeBron.