We are still living in a world where we still have two bands of network—2.4 GHz and 5 GHz. There are two reasons for this. First, many devices, such as smart home devices, still work only on 2.4 GHz, and second, it offers a more extended range than 5 GHz. Since not everyone can go ahead and buy routers with extenders, the 2.4 GHz ensures a fallback range to keep the connection alive. So when you have both, chances of a stable connection and broader support are available.