Gaming corporations are doing their damnedest to get rid of emulation and piracy on top of getting rid of original versions of these games. Sure, we can re-download these things from piracy sites but keep in mind that these sites are constantly being attacked by copyright ghouls. Archive.org or your favourite rom or torrent site might not be around tomorrow. The internet is becoming increasingly corporate and restricted and it's important that these things not be lost to time and the only versions left are bastardised "remasters" locked behind a subscription to be ended anytime or until the next bastardised remaster comes along.
And if you're lucky enough to own a physical copy of a game, learn how to dump that shit onto a computer.
http://redump.org/
This is the website that you should be looking at. It is a database of the hash checksums of every disc of every console. You can make checksums of the discs/iso that you have an compare it to the database to see that your rip is done correctly.