Sorry to disagree with you, but that is not necessarily true:
"During import, you can choose either to move or copy the photo files into a specific folder, or
reference the photo files in their current location." [emphasis is mine]
Link
What you are talking about is the "reference" option. If someone is importing their images directly from a camera or memory card, then referencing won't work since the images won't be available to LR once the memory card is formatted for the next shooting session.
I'm not sure what the default import action is, but I believe referencing photos in their existing location is not usually the best practice. It's too tempting to much about with the photos outside of LR, which risks corrupting the catalogue (the database). There are very few reasons why someone should need to access their images outside of LR. I choose to let LR do what it was designed to do, and to work within LR for all my needs.
Most of my images are imported from a memory card, so I've set LR to copy the image and convert to DNG. I store the memory card for a few days, until I've got a good backup of my LR images. Eventually I format the card, and use it for the next shooting session.
LR also has the ability to copy the imported images, during import, to a backup location.