>>48493402You could obtain all Pokemon uptill that point (excluding Mythicals) in Gen III and DP itself, so HGSS wasn't really necessary for Dex completion at the time it was released, unlike FRLG.
Anyway, ORAS was a shit remake not because it didn't change anything, but because it completely ignored Emerald (apart from the Battle with Wallace outside of Sky Pillar), made the game piss-easy by handing you the broken Gen VI Exp Share before you even reach Rustboro, used the Ruby and Sapphire Gym rosters, and handed you a Lati@s after the 5th Gym Leader. It also cut content from RS like changing the map of New Mauville or removing the Poffin minigame. On the other hand, it added a fluff that no one really wanted like tons of new Megas and the Delta Episode with Zinnia, an obnoxious Mary Sue. Even though I liked going into space on Rayquaza and batting Deoxys, the story resembled a poorly written fanfic and required far too much backtracking. ORAS probably changed the originals more than any other remake, which was in some ways a good thing and in many ways a bad thing.