Why isn t fusion used more often?

Why isn't fusion energy harnessed and utilized more frequently, despite its potential to revolutionize the energy sector? Could it be due to the complex scientific challenges that remain unsolved, such as containing and controlling the immense heat and energy released during the fusion process? Or is it a matter of economic feasibility, with the high costs of research and development proving to be a barrier to widespread adoption? Furthermore, are there any environmental concerns or safety issues that have hindered the progress of fusion energy, making it less attractive as a viable alternative to traditional energy sources? It's crucial to delve deeper into these questions and explore the various factors that contribute to the limited use of fusion energy, in order to understand its potential and the challenges that lie ahead.