I have never lost data because I did not delete it. To have Lightroom do an automatic delete after import, you would want it to have an ironclad, fail proof way of verifying the download went correctly. To do that would require two way communication and buffering on the card reader or camera you are using to download from that I am not sure they have. I see this as a solution looking for a problem, high risk with no discernable benefit. I see no advantage to using DNG either. It uses more space and loses some of the metadata too. You are also assuming Adobe will always interpret the RAW data correctly. I have sometimes used Canon Digital Professional when Adobe could not get it right. I prefer storing the original file.
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