Almost all cars have turbos, all have abs/airbags/cameras... even counting the seat foam & covers, wheels, door cars... how cheap do you think a vehicle safe and comfortable for humans can be?
The average car has tons of moving parts that have to be weatherproof, shakeproof, pothole-ready... stuff consumer tech doesn't dream of. It also has to be repairable, be engineered to meet all the regulations in various countries so the manufacturer doesn't make 15 versions for different countries...
A lot of things are overpriced in the world; I'm not sure cars in general are high on this list. If you want a car similar to a high end 2015 car, the 2025 Jetta has more than anything you could have gotten in 2015 and I'd say with inflation the price is lower today when you account for inflation.
I had a Jetta as a service loaner recently and it drove great. $25k cars are still out there, you just can't get a $25k 4Runner.