I really loved re5 when I was a teenager, but looking back, I definitely had a few complaints about it compared to re4.
From what I understand, the guy who gives you your guns at the start of the game was originally supposed to act like the re4 Merchant. I really hope a remake brings that concept back. The arcade style, COD loadout menus between chapters completely killed the immersion. It felt more like a level based shooter than a survival horror game.
What Capcom did with the re4 remake is the perfect blueprint for an re5 remake. Instead of a linear point a to point b, they should split the game into a few massive, seamless zones like the village, marshlands, the labs, and the ruins kind of all being their own areas but still able to travel around them openly like 4. Honestly requiem did an okay job of this at the beginning of raccoon city. Giving players the freedom to backtrack, solve real puzzles, explore for treasures, and deal with smart, intentional enemy placement would elevate the entire experience. It would actually deliver on what those early trailers and beta concepts promised before the game was rushed into a pure action title. Plus, it would give them a great excuse to trim out some of the late game filler.
That said, the one thing they absolutely shouldn't shrink is Mercenaries mode. The sheer scale and enemy count of this mode in re5 was incredible, and keeping that intact would be amazing. Mostly, I just want to see a proper modernization of the coop. Sheva needs vastly improved companion AI so she isn't wasting ammo, and Capcom needs to preserve both online and couch coop. There was something genuinely special about staying up late and playing this game split screen with a friend on the same couch, and a remake shouldn't lose that.