The series thread has Tatum discussions, but I will post here.
He didn't play well and looks to have lost confidence in his shooting. He isn't playing like the best player in the series, but he is doing a lot to help them win. Maybe he isn't the alpha, or MVP we want him to be, but he doing what it takes to win. I think his success at such a young age, and the recent trend of big numbers (due to players entering NBA earlier, and a high scoring era) lead to all kinds "No Celtic did _______ by age ____ except Tatum" has created some unreasonable expectations to Bird and Pierce. He probably will never be the clutch scorer either guy was, and will never be the GOAT forward like Larry was in his day, but he is an excellent all around player, and if the Celtics continue and win that will be the narrative, the better team won and Tatum is the best all round player.
The emergence of Jordan, Stern's decisions to promote individuals over teams, the cult of Kobe, has laid out the false narrative that scorers dominate. If you notice in all the nostalgia promoting the finals the Russell Celtics are virtually always absent. Some of this in NY/LA bias, but also it is bias to promote stars not teams. It is one reason Tim Duncan and the Spurs five rings are treated like they didn't happen, they were a team. All the hype of the dimwits on the pregame show before game 1 was about how the team with two best scorers was destined to win, but it is team game and Tatum is a team player. I do hope he shoots better though.