Suppose a player joins with a username "user", but later changes their name. If another player changes their name to "user", the associated scoreboard data for the original player will tie to the new player, which could have unintended consequences such as two players with the same ID.
Suppose a player joins with a username "user", but later changes their name. If another player changes their name to "user", the associated scoreboard data for the original player will tie to the new player, which could have unintended consequences such as two players with the same ID.