They overhauled the skill system in 2.0, and the major bugs like police spawning were fixed a while back. There might be some stuff from early marketing that still never made it in. I know the rail transit system was one of the common talking points, and it’s in there now, but I wouldn’t call it an essential part of the game or anything.
That said, I first played it after 1.3 and I can’t say I ever felt like it was outright incomplete. It’s probably still the most technically impressive game I’ve played and it’s a fun sandbox. Solid writing and voice acting, too.