Why is Ninja Forms not supported anymore

In version 3.6.0 of the main Ninja Forms plugin, the submission table is completely refactored. Instead of using the WP List Tables, the table is now completely custom-built without using the functionality of WordPress that is needed by Admin Columns Pro to manage the columns. Since the submission table is the main reason for the existence of our Ninja Forms integration, we had to drop the support for Ninja Forms