LoRs, Waive My Rights or Not

It's has always been noted that "waiving your rights" for the LoR carries an advantage over not doing that with regard to letters of recommendations for residency application.

However, I personally think that not waiving the rights carries significant advantages, these are:

• Faster processing time, as the letter writer does not need to write coversheet and DSF and send the letter by himself/herself.
  
• You yourself read the LoR and see if there are mistakes in it, such as the AAMC ID number or the spelling of your name.
  
• In rare instances, the letter writer may actually write bad about you!

Let's see what you think about that?