Translation: "Mass Effect" was never written to be a franchise. It was started and developed as a trilogy from the get-go. We pushed for the Mass Effect 3 ending to be changed at the last minute so we'd have room to keep going with the series. Since it was never meant to be a franchise, the writers wrote the franchise into a corner, since they'd always planned ME3 to be the end. Our only option was to jump centuries forward to a different galaxy altogether just so we could completely dilute the ending of ME3 and have somewhere to go with it. But we can't really say all this publicly, even though core fans already know it. So we're gonna just come up with come contrived excuses for the ME3 save files being completely useless.