The standard/built in Slicer allows you to only have one field. It would be great to have a table slicer that can display many fields. When you click on a row in the table slicer, it would filter the by one field that you nominate in the visualisation properties pane.
The benefit of a table slicer is to be able to display additional information that may be useful for the user to know before they apply the filter.
A simple example - If I wanted a slicer to select one or more Employees, it would need to be based on 'Employee ID'. However in this scenario I would also want to show Employee First Name, Last Name, Department etc to help the user know which Employee ID to select.