I’ve seen dash cameras that claim to have features like lane departure but they’re absolute junk. To have those features work properly with a vehicle requires a lot of specific calibration and design work, and generally uses some small radar systems, which is why they need to come with the car from the factory. Even with a backup camera, an aftermarket is better than none, but an integrated camera with lines that help gauge distance and that turn with the steering wheel is so much nicer.
If those are the features you’re looking for you’ll probably be better off saving your money for a newer car with those features. None of them are necessary, but they can be a nice addition, and especially the safety features you hope to never need them but if you ever do and they save your life or save you from an accident at all, they’re really worth the money.
If you consider looking at a newer car, if you’re able to charge at home you might want to consider a Chevy Bolt EV or EUV. They stopped building them last year, but if you can still find one at a dealer they start under $30k with a lot of those features, and all are available for not much more. Like, the base model has forward collision warning, and if you get the higher trim it becomes forward collision warning with automatic emergency braking and adaptive cruise control. And now you can get the $7500 tax credit applied right there at the dealer. Even buying used you can still get a tax credit from the federal government, whether at a dealer or private sale, but you might have to wait until you file your taxes to get the money back. I wound up in one for several weeks while my wife’s car was in the shop and was surprised at how good it was, especially considering the price. And charging at home meant my city driving cost per mile was 2¢/mile, while my wife’s Kia Soul was 14¢/mile on gas. The only drawbacks it had was paying to fast charge was more expensive than gas and slow by current standards (an hour), and the cup holder was slightly smaller than most cars. But if you can charge at your home and don’t go on long road trips where you’d have to charge every couple hours it could be an ideal fit.