I'm totally gonna get roasted for this, but I'm disappointed in the comments here.
The game has gone through a major overhaul in the past few years to become something way better than it used to be. Meanwhile, everyone here is complaining about things that, honestly, I think are pretty easy to assume or are non-issues.
ArmA 3 has similar bugs with cars and what not, so it's clearly a fundamental issue with the engine that may not be that easy to solve. Perhaps they are working on it, but the only real solutions would be completely game breaking, and any existing mods or communities would crumble if they tried to port over.
I started to play the game again after a couple years and it's already way better than it used to be. We ran into some odd bugs maybe, but most of them were issues with the mods that were on some servers, or maybe the servers are overloaded, or users with 100-200+ ping are on the server. And of course I'd love to see some performance improvements (since car problems mainly on happen on laggy servers with more than 60 players), but that can also come down to people straying from the recommended hardware or configuration.
At least be grateful that they added quite a few things for mod developers through the API. Perhaps this will help with mod stability.
If you really are so upset with all the lack of changes here, maybe go make your own game that has no bugs and can handle dozens of users on the same server with mods.
Or better yet, just stop playing DayZ. That will hurt them the most. Everyone publicizing the game by playing it will only get more and more people that are just fine with the game as-is.
Be grateful that they at least got the game to the playable state and, frankly, revived the player base by doing that. They could have easily just given up on the game completely.