Dead Space Remake added a bunch of bloat to the characters where things were originally efficient and unmuddled. They made Hammond (Black soldier ally man) have a lot of overrought pathos about one of the guys at the beginning of the game dying and rather than him being torn to shreds by a Brute type necromorph he ends up getting fooled by the corpse of his dead mate into an heroing.
Kendra (Traitor whore) gets visions of passed loved ones and a lot more done to wring sympathy out of her character as possible before she betrays you, then sincerely explains her betrayal of Isaac and theft of the Marker as being for the best.
The kind of changes that change the fundamental dynamic you have with these characters. Hammond and Kendra in the originals are consumate professionals and do their duty to a fault, but both are mashed in the Necromorph meat grinder anyway. The more stuff you strap on to them the more you take away from that efficiency.
Honestly of all the SH games you would have a good reason to remake, you could make a case for 4. A version that you'd actually want to play more than once would be nice. Not that I trust anyone to make it.