Celtics over/under seems... high

Per FanDuel, the Celtics have a 49.5 over/under on their win total. That's higher than everyone in the East except the Knicks (51.5) and the 76ers (50.5), and tied with the Pistons.

Does that seem high to anyone else? We still don't know if Tatum will be the same player he was before the injury, Paul George is a major downgrade from Jaylen Brown, the frontcourt is heavily relying on Mitchell Robinson's health and another good year of Neemias Queta and there's really not that much guard depth. Are these valid concerns, or is the regular season wins machine going to keep rolling?