In this case, its actually required. The state is actually for the entire chart. It has lots of settings not just the time duration but type of chart, crosshair

In this case, its actually required. The state is actually for the entire chart. It has lots of settings not just the time duration but type of chart, crosshair should be set or not, then there are several types of chart studies which could be applied on chart along with their own settings. And also the chart drawings with their own settings. This feature is there so that people can share their own customized chart in full with others, and not a generalized chart.