Suppose I can add custom field called 'task status', and then I have ability to sort the kanban board by 'block name' or by 'status'
That way in one go I will get a dashboard view of various tasks' status.
Similarly, if I can add a custom field for 'context' of tasks - meaning activities I can do from office, from a project site, or emails, phone calls etc, and then have the ability to sort tasks by 'context' then when I am at the site, I will know all the things I need to attend, or when I am in transit, I will know all the phone calls, emails I need to send out.
Others may have other custom fields, which they may want to add and use for their line of work.
Please look at www.smarttask.io
Their custom fields are amazing!!