Cloning my platter drive to an SSD. Why have a recovery partition ?

Using SuperDuper, a clone of my new perfected internal platter drive was made to an external USB platter drive. When I replace the 750 GB internal platter drive with an internal SSD then clone the external back to the SSD, there will not be a recovery partition.

Have also made a 10.74 bootable recover USB thumb drive and it works fine.

QUESTIONS:

1. Will the bootable 10.74 recovery thumb drive do everything the internal recovery partition would have done ?

2. Other than convenience of not needing the bootable USB thumb drive, what is the advantage of having the recovery partition internally ?

3. If the internal recovery partition is very useful compared to the USB, how does one transfer the external SuperDuper clone back to the new internal SSD and still have a recovery partition on the SSD ?

Interestingly, made a dmg master of the USB bootable thumb drive saved to the internal drive, then burned it to a DVD, and the DVD is not recognized as existing by the MBP.

4. Is there a way to make a bootable DVD which acts like the recovery partition and the recovery thumb drive ?