redpringles wrote:
Even if the letter is only available after submission, the writer can have a different attitude when he / she is aware that the applicant will eventually get to read what the writer wrote. In my point of view, this is similar to feedback systems that are common in many industries and firms. When you seek feedback from your colleagues, (whether it's upstream or downstream) people who give feedback have potential to be not as honest when the system is not anonymous.
This was my thought process. Also, trying to put myself in the adcom's shoes, why would you want/need to see the recommendation if you know it will be positive? Again, this probably isn't a make-or-break thing, but I did not want that data point going against me.