Because why not? It's far more often than not that for whatever reasons the dialog sounds are just terrible. They don't care about the audience hearing the dial

Because why not? It's far more often than not that for whatever reasons the dialog sounds are just terrible. They don't care about the audience hearing the dialog(see Tenet). A show which guarantees that you can hear every line clearly is the outlier now. Might as well just set cc on to default