Franklin Roosevelt actually said...

Yes, because people did not write as much in those days.

I wanted to make sure that this archive is well preserved and accessible to future historians.

It is my desire that they be kept as a whole and intact in their original condition, available to scholars of the future in one definite loc...

There is not. I think you will find among the papers three diaries that started on the first of January in three different years, far apart.