This is something multiple lenders have requested and is a measure to see how the product landscape (and rates) have evolved over a period of time. This would also help manage any queries from intermediaries where any old rate or product details are being questioned.
This might pose complications on the way we currently update the products and maintain the database from the Data Team perspective, but definitely something worth exploring. At least being able to have a view on how a product would have been sourcing in a precise moment in time and its product details.
It may also mean challenges for the capacity of our database and the amount of historic data that we would be able to store.
It would certainly be useful though.