isn't this what I've said? and NO!, it's NOT stupid.
you're saying that coz you have no Idea what those things are

from that time, flash media isn't that widely available, usually expensive.
that's why manufacturers resorted into CD's and Zip Drives.
flash roms were available for expansion of the gb/gbc, of course games for those handhelds didn't require much memory so the manufacturing price isn't that huge compared with 8-64meg requirement of the standard n64 games
Typo, it's Docv64 / Docv64 Jr, it's undoubtly the BEST compared with
cd64 and those stuff using zip drives!