Based on the teardown the repairability of the Samsung Galaxy A51 would likely be around a 6 or 6.5 out of 10. While some components such as the battery and screen can be replaced individually there are many small parts and adhesive that would make it difficult for an average person to repair. Additionally the need for specialized tools such as a heat gun may also make repairs more challenging. However the device does have some modular components such as the cameras and charging port which could make repairs easier. Overall the device would require some technical knowledge and patience to repair but it is not impossible.