I think this is a great thing. I'll tell you why.
When a game releases, reviews come out for the game you get out of the box (plus maybe any day one patches). People will make their decision based on that. If the game's not good at launch, a person will see those negative reviews, and make their decision accordingly.
However, if a game improves a ton post-launch, and the old reviews are still there, new purchasers will look at reviews and see the game is not good, even if that isn't indicative of how it is in its current state. That's not good. The game these new buyers are looking into is NOT the same game that was reviewed at launch. It's not important to them what the game was like at launch. If they see reviews have been updated and better, however, they may decide to buy it.
I agree with this.
I just don't think the onus should be on the reviewer to go back to a bunch of games they reviewed before and assess the changes.
If it's a big enough deal, the publisher should resend review copies or repackage the game as some kind of... I don't know, ultimate edition or something, with the additional content on the disc
I agree with this too. The onus is not on the reviewer certainly. Yeah Sony could repackage the game and give some name to it and send it for review but yeah I dont think it would be worth the effort for Sony unfortunately.