So I had a solid play through of C&C recently, somewhat enjoyed it though I found the level design extremely frustrating in some cases and that was more to do with the original game than anything else remaster wise. However it turns out there's an extremely well known bug that hasn't been fixed where when you get to Soviet Mission 12 technically two bugs because it involves units suddenly becoming invincible for no reason and the fog of war not going away. Finished the Allied Campaign with zero problems.
This along with Baldur's Gate 2 in particular and their cultural vandalism of trying to introduce a bisexual character ( forgotten what she was supposed to be exactly but it was the wild mage ) in the game for no fucking reason makes me feel that remasters just shouldn't be a thing. Even with the best of intentions they seem to introduce bugs and never fix them and then to make matters worse because they deliberately wipe the original from the stores that means you can't get the game that would run absolutely fine without resorting to piracy.
Full re-work of the game or bust as far as I'm concerned, use the old assets if you have them, but I don't ever want to see them re-using horribly buggy and glitched code and they should put it on an up to date engine too to prevent problems.
im fine with both but it depends on what that game needs
Some graphics stand the test of time, others become a jumbled mess to our modern eyes but it all feels fine mechanically, feel free to just bring those up if the mechanics are all still passable.
But yeah old controls can be jank, sometimes a game needs a mechanical remaster, ai improved, and bugs removed.
Just make the game open to modding though, and if it's good people will make graphics remasters for you, for free.
The pathfinding and AI in particular for C&C drove me insane lol I also hated their no-base levels because it made me realise being older they were actually pretty buggy and weird. Sometimes older games weren't difficult to play because of the design sometimes they were difficult because it was just bad.