My assumption, but I'd bet the ranch that just like me, you get frustrated when an agent won't provide feedback.
Of course, almost as frustrating can be when:
(a) The Listing Agent calls you 2 SECONDS after you show the home; when you still have the clients in your car; you are busy driving to the next of the 15 houses on your tour; are trying to read the map or set the GPS while explaining to Mr. and Mrs. X that you can't take time right now to show them that $100,000,000 house for sale they drove by last night, "JUST FOR FUN...",
or
(b) The Listing Agent calls you 2 WEEKS after you show their listing, and of course you are again driving with clients in the car and you have no idea which house was the "3 bedroom, 2 bath with the really nice yard" and the Listing Agent just can't understand why you are so dense….. “Come on! You know! …The yard with the little tree in it. Remember?!....It had green leaves!....”
Personally, I prefer receiving emailed feedback requests from Listing Agents (rather than phone calls) which include the MLS listing itself (photos, price, the whole enchilada).
AND to help make that happen more often I have a special set of business cards to leave in homes after showings. They have my name and company info, my email address, NO phone #, and direct the listing agent to ONLY email me for feedback including the MLS#, or preferably the actual listing with the email.
Of course it's not foolproof, but it does increase the odds of getting the requests via email. And when I do get them that way, with the MLS listing attached, 99% of the time I can respond within hours, even if many days have passed since the showing. Win/Win!
Then I have time to go sneak a peek at the $100,000,000 listing myself....JUST FOR FUN! (Only kidding here!)