The difference in recommended viewing distances is due to the resolution and pixel density of your TV. TVs with higher resolutions, such as 4K and 8K, have more pixels packed into the same screen size. This means you can sit closer without noticing individual pixels, resulting in a more immersive experience. On the other hand, HD TVs have a lower pixel density, so sitting farther away helps to avoid seeing the pixel structure and ensures a clearer image.
The recommended distances are technical guidelines based on optimal viewing conditions, but personal preferences and room setups can influence how close or far you sit. Factors such as eyesight, comfort, and room size might lead you to prefer a different viewing distance. Additionally, some people enjoy a wider field of view, while others prefer to sit farther back for a more relaxed experience. Ultimately, the best distance is one that feels comfortable and suits your specific needs.