disc rot could be a problem in future, right now we still have 30 years old discs that works perfectly, maybe they will last another 30 years, who knows.
Keyword "who knows" - i had two copies of the same GC game, one was sealed and never opened for 3 years. When my friend asked if he could borrow the game and i was playing it, so i decided to open sealed game and give him another copy. Imagine my surprise - the disc was unreadable. Without visible signs of rot. Under the microscope it looked like some pits became "flat", was it like that right from the factory - i don't know but it is what it is. Also i had a music CD which became unreadable after a year. It wasn't a pirate cd, it had no scratches or visible signs of rot. So it's all about luck. You can copy ALL DC games to a few 4Tb drives and copy to new ones once in 4 years. That will be the the easiest way to be sure that games won't perish. More expensive - LTO tape backups.
Also ODEs are silent and fast. I owned a Spectrum and was loading games from the tapes, C64 floppy drive wasn't super fast either.
My first 386 PC had no HDD for a year so i managed to split Dune II across multiple floppies, one was to load the game, then it was Harkonnen, Atreides, Ordos, ending disks. Game designers probably had floppy swapping in mind since when game was unable to find some file it was displaying a dialog like "please insert a disk with SCENARIO.PAK file" or something along those lines, so it was about rearranging files so all commonly used files will be on one floppy for less swapping.
Will i use those methods of loading now? Not really, maybe once in a few years for the nostalgia reason.
Same with DC - for starters DC GD-ROM is noisy. Tr-trrr-gr-grrr all the time. I obviously have one untouched DC with GD-ROM but i prefer to use ODE to actually play the games on original hardware, for example games with VMU minigames or those which aren't perfectly emulated, and DC emulation at this point is at "good" level, but still far from perfect.