Because that's the actual standard for cellphone communications. 4g and 5g are LTE, for which my phone needs to be compatible with if I want to use for years to

Because that's the actual standard for cellphone communications. 4g and 5g are LTE, for which my phone needs to be compatible with if I want to use for years to come. The fact that I chose not to use cell data is only a question of choice. The choice of connecting only when I do need a connection.