Who Is This For
If you won, then you will hear valuable information about what the Buyer liked about your offer. You can then use this in future tenders.
If you lost, then you *might* hear valuable information about what the Buyer didn’t like about your offer. They won’t always want to tell you, especially if your tender document was terrible. People don’t like being being negative, so they usually default to a conversation about price. BTW it is worth noting that if your tender document was terrible, then they would not have understood your value, and therefore price is the only criteria by which they can compare you to others.
How this helps
Document the feedback and keep on file or in a database somewhere to keep track. Review regularly.