It would be helpful if we can sort Lists either via a relationship with a task or other list, or via tags.

We use various lists to manage large client projects. I know an automation or bulk edit of tasks can be used to tag list tasks, but it makes some of the custom dashboards difficult to manage. A simple tag or relationship function at List setting level will allow for more dynamic reporting and dashboards where different lists are used. A lot less friction and programming necessary to link Lists if there is a setting at List level