I'd rather them have feedback over a DL or CCW but I do ask to take a peek. I feel like you can do your own due diligence or the government will eventually do it for you, as in no more private sales without an FFL.
I you really want to get serious about your "due diligence" you would go through a FFL holder for each and every firearms transaction.
There's no need in doing half measures, do the full monty?
The prosecuting attorney's opening statement: "Since you were checking DL and GWL, then you must have had some suspicion that the buyer was a criminal, before you sold the mass school shooter the weapon."