Well that is interesting!
I didn't know about that. I had a look for my old Inspiron 17R SE 7720
(shipped in October 2012) and there were no images or other options
available.
Then I had a look for my not-quite-as-old Latitude E5450 (shipped April
2016), and I had the option to download a Windows 8.1 image for manual
install.
So for a recent, still in warranty XPS 13 7390 laptop, I was given the
option to download a Windows 10 image, and have the hardware scanned,
backup the data, guided help, install critical drivers etc, etc! Or I
could just download the image and install it manually.
Good stuff!