But why have it unnecessarily big when it can easily be 1/3 the size with the available Tool? (pun intended )

Bandwidth is still an issue for people, and if not the downloaders, then the hosts. And then there's the slow speeds. Sure, you might have a FiOS line capable of 2.5 MB/s (hell, I downloaded a 6 GB file in 40 minutes Saturday morning), but if you can only download at a mere 50 kB/s because of the load and/or shared hosting site limits, then you're not going to finish for a long time.