Not all cars come equipped with a turbocharger or supercharger because of a few key reasons:

1. Cost and Complexity

Turbochargers and superchargers add parts and engineering complexity—things like intercoolers, piping, stronger internal components, and (in some cases) more robust cooling systems. All of these increase production costs, which manufacturers must pass along to buyers.

2. Efficiency and Emissions

While turbos can improve efficiency in certain conditions (particularly smaller engines that otherwise might struggle at higher RPM), forced induction systems also create additional heat and emissions complexities. Designing engines to meet strict emissions regulations and still remain reliable and efficient can be more challenging with forced induction.

3. Reliability and Maintenance

A simpler naturally aspirated engine often has fewer failure points and can be cheaper and easier to maintain. Additional components like turbines, bearings, and belt-driven superchargers introduce more potential wear-and-tear items.

4. Power vs. Practicality

Not every vehicle requires the extra power of forced induction. Many economy cars or basic transportation vehicles have enough power for daily driving without a turbo or supercharger. Adding forced induction to these vehicles would drive up costs and might not align with their intended usage.

5. Parasitic or Turbo Lag Effects

• Superchargers: Although they provide instantaneous boost, they draw power directly from the engine (a parasitic loss).

• Turbochargers: There is often “lag” before the turbo fully spools, affecting drivability in certain scenarios.

Overall, whether a car is turbocharged, supercharged, or naturally aspirated is a balancing act between performance, cost, efficiency, reliability, and market requirements.