Hi Scook,
Because?
Extract from Cakewalk documentation ...
https://www.cakewalk.com/Documentation?product=Cakewalk&language=3&help=FileManagement.3.html#1117028
Bundle files are useful for backing up projects and for burning onto removable media, like a blank CD or DVD.
I always us 'Save as' as a matter of course after making major changes to projects and increment the version number of the project, This however can lead to multiple (>10 or 20) versions of projects all held in the same folder, and once the song is completed I only really need to keep the last version of the project. Hence why I prefer converting that to a bundle rather than zipping up the entire folder.
But I'm always willing to be educated otherwise
Cheers
Al.