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.
I think I'm in the camp of remasters should be their own versions in hindsight, leave the originals alone and simply make it playable on modern systems. Better to have a new game on a modern engine and reworked and it would potentially give a much better experience if it's relatively bug and problem free. Some of the design decisions in the original C&C games even though they were good games overall were awful, hated the pathfinding and AI.
That's how Metal Gear Solid: The Twin Snakes (a GameCube remake of the original for the PlayStation from 1998) was done. They took the MGS2 engine, remade the assets (including re-recording all the dialogue, bc the original recordings were unusable in the higher-fidelity consoles of the GC/PS2 generation) and plopped those into it, and bam. MGS with high-poly graphics, first-person aim, all the modern conveniences.
Now if they'd just ported that to the PS2 (or 3-5)....