I played the original twice, 2008 I think? Also bought the original from EA on sale, but stopped as everything unlocked - no challenge or feeling of reward when getting a new upgrade etc.
Anyway, to your question the remake is an improvement. Of course it takes a fairly powerful rig to get the most out of it I have ROG Strix RTX 3080ti. I have had no stutter, all smooth, no crashes at all. Also it may be my age, but I feel it's a bit harder that the original. Also there is more freedom to bo back and do side missions, or do them as they come.
So, you are missing nothing, and getting a game with great graphics (with right Hardware). There are extra side missions too. The original is now considered a real classic space/horror so I don't want to compare subjectively. Technically the new one is far better.
P.S I know many people will strongly disagree with me as there are many posts about various smal - l and serious bugs - none story progression and more. But I have experienced none of that, just a demanding game which tales a bit of time to get right in NV control panel (or AMD equiv.) and set graphics in game. I was able to re-set graphics menu 3 times and now running all on Ultra with DLSS quality or whatever it's called in AA option. TAA is available too. In fact I've maxed it out now. My CPU btw is i9-9900ks OCed to 5.2GHz stable, matches my GPU well.
I can't complain as simply everything is running very well indeed. I don't know, maybe I am lucky? But absolutely the remake is the best IMO regardless of having played the original or not.
I use EA app, not via Steam, but that should make no difference. Also my xbox 1 wireless controller works perfectly. I wasn't sure about that, but it does. Switch on before starting the game.
Enjoy - and take time/read up on graphics settings. I say that due to the many posts of folks who have had various glitches.