A result of the era they play in? Perhaps.
Brown's first make from 3-point range in Game 3 was his 50th of the postseason for the Celtics. By hitting that milestone, he joined Tatum -- already up to 64 entering Game 3 -- as the first set of Boston teammates to connect on at least 50 attempts from 3-point land in a single postseason.
Ray Allen made at least 50 shots from 3-point range during each of the Celtics' runs to the Finals during his tenure in green. However, teammate Paul Pierce maxed out in the 40s each time.
For context on just how different the times are, Larry Bird made only 80 3-pointers in the postseason...for his whole career.
Depending on the length of the 2022 NBA Finals, there's a chance Tatum could surpass Bird's total.