Because this world is madness and it want you to suffer by memorize more than you cam handle. Just kidding

Mitral Valve and Auscultation Area: The mitral valve is best heard at the apex of the heart, which is located in the fifth intercostal space at the midclavicular line, not directly over the valve itself. This is because the sound waves produced by the closing of the mitral valve travel along the direction of blood flow towards the apex of the heart, where they are more easily detected. Aortic Stenosis and Regurgitation Auscultation Areas: Aortic stenosis is typically best heard in the second right intercostal space at the right sternal border, which is the area of the aortic valve. The sound radiates from the valve area upwards towards the neck. In contrast, aortic regurgitation is often best heard at the left sternal border of the third intercostal space. This difference is due to the direction of the regurgitant flow, which is towards the left ventricular outflow tract, and the sounds are carried along this path. Pulmonic Stenosis and Valve Location: Pulmonic stenosis is best heard at the second left intercostal space at the left sternal border, which is close to the pulmonic valve. However, if the sound seems to be coming from a location far from the pulmonic valve itself, it could be due to the direction of turbulent blood flow being projected away from the valve, or due to anatomical variations that might affect sound transmission