I guess they want to limit your time with them. If you could study them whenever you want with whatever tools you have, you can easily find conflicts between the plans and the building regulations. This would allow you to block the planned construction works.

Even with the current protocol people find ways to block "progress". For example, the Oosterweel Link [0], which has been postponed multiple times.

[0] https://en.wikipedia.org/wiki/Oosterweel_Link