4.7GB is quite enough for a standalone Linux DVD (for devices that still have DVD drives). Plus some cool art.
Might be a good idea to preserve a known-working distro for some old PC, especially for discontinued or less-used architectures. Just saw a discussion the other day about finding 32-bit Debian for an old laptop.
I don't know how it ended up with later generations, but all the CD-R and DVD-R discs that I thought I had archived everything on became entirely unreadable after something around 7 to 8 years.
