Understanding what others like or did not like is very valuable to an owner. After living in their home for so long, they have made changes and decisions that made the listing a home for them. So having new information helps to shape what works and what does not for a potential new owner.
A listing agent can set feedback requests to be sent multiple times to try and get this information. It is customizable for each agent and in some cases an agent may have taken steps to customize it in a special template for a particular listing.