Work-in-progress (WIP) is a key design principle for Kanban. The ability to limit the number of items for each status column is part of the Kanban workflow. The limits per column should be user assignable and display their status on each column. There should be an option to allow or disallow adding items to a column that has reached it's limit.
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We have made a variety of improvements to the Workflow page, including the ability to see estimates by column and assignee.
At this time, we do not have plans for additional updates in this specific area based on community feedback and current priorities. However, we hope that the recent additions will help. We hope you can understand.