The advantages of mixed PCB assembly include:

1. Design flexibility: Mixed assembly allows for the use of both SMT and through-hole components, which can be useful for complex or specialized designs.

2. Cost savings: Using through-hole components where appropriate can help to reduce overall manufacturing costs.

3. Improved reliability: Through-hole components may offer better mechanical stability and are less likely to be dislodged by vibration or thermal cycling.

4. Improved performance: SMT components can offer higher performance due to their smaller size and higher component density.

5. Increased component compatibility: Mixed assembly allows for the use of a wider range of components, including those that may not be available in SMT or through-hole packages. This can be especially important for legacy or specialized components.

6. Improved heat dissipation: Through-hole components can help to dissipate heat more effectively than SMT components, which can be important for high-power applications.

7. Easier assembly: Mixed assembly can be easier to assemble than purely SMT or through-hole PCBs, as it allows for a combination of automated and manual assembly techniques.

8. Improved signal integrity: Through-hole components can help to reduce signal noise and interference, which can be important for high-frequency or sensitive applications.

9. Enhanced mechanical stability: Through-hole components can provide greater mechanical stability and resistance to mechanical stress, which can be important for applications that are exposed to vibration or shock.

10. Better accessibility for testing and repair: Through-hole components can be easier to test and repair compared to SMT components, which can be important for applications that require frequent maintenance or repair.