Why is the exact night of Laylat al-Qadr concealed?

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Some scholars posit that Allah concealed this night from the Ummah so that they would strive to seek it and exert themselves in worship throughout the entire month in hope of attaining it. This is analogous to how Allah concealed the hour of acceptance on Friday so that supplication would be frequent throughout the day, and how His Greatest Name and His pleasure in obedience are concealed so that striving for all of them is maintained. Similarly, the appointed time (of death) and the Hour of Judgment are concealed so that people remain diligent in action out of fear of them.