While I think this is really cool, and would have come in handy earlier in my life. Where I’m at now I don’t commonly install new OSes, and if I want to play with a new OS I’m more likely to do it in a VM. So the only time I really do a fresh install is every 5-8 years when I do a full new build.
This is a slick solution, but I think the average person it would be easier to just copy paste the files from the iso onto a usb and call it a day.
AND.... anyway it very often doesn't even work. Many UEFI BIOS are very opinionated about what they consider bootable.