I'm not part of the team, but I act like it anyway so here's my feedback.
Isn't the REVOKE command supposed to revoke already GRANTed privileges? If so, wouldn't it be redundant as unticking the GRANT checkbox should accomplish the same?
Currently pgAdmin application is having a function on 'Granting Privileges' for tables and we would like to also involve 'Revoking the Privileges' as well.
So feel free to provide your feedbacks/comments like as a user is it making sense to you or not?
Note: Please make sure that your focusing area would be the popup only