Why were actors in Shakespeare’s company given only their own lines and cues?

In Shakespeare’s company, actors were typically provided with only their own lines and the relevant cues in manuscript form because the company did not immediately print their play texts to prevent them from being pirated by rival theatre troupes.1

Furthermore, there was very little time available for group rehearsals in the Elizabethan era. By providing actors with only their specific parts and cues, the company managed the distribution of their scripts while navigating the logistical constraints of their production schedule.21