Why dont they say 5 during a launch?

During a launch countdown, the phrase "we have a go for launch" is typically used instead of saying "5" to avoid confusion and maintain clarity. Saying "5" could imply that the countdown has reached a critical point, potentially causing anxiety or miscommunication among the crew and mission control. Additionally, using a verbal cue like "go" serves to unify the team and ensure everyone is synchronized in their readiness for launch.