I asked a professor for a recommendation letter for my Ph.D. application, and she said something like
Sure, I am willing to write you a letter. Can you send me your research statement and school list by XXX date? Also please request all letters in a batch so that it is less likely for me to miss any request.
I understand that she needs my research statement to see what I want to work on, but why ask for a school list? I mean, she will know what schools I am applying to when she received the requests. She also doesn't need to keep track of the submission status for each school since everything will arrive in a batch.
I didn't ask her directly since the last thing I want is to annoy my referee with an unnecessary/stupid question, but I'm still curious to know the possible reasons. Is she going to review the list and suggest I refrain from applying to programs she believes I am unlikely to get into so that she won't waste time submitting a letter? Will she customize the letters for each school?