Improvement
We've deployed v1.2 of The TNC Toolbox for Managed Server clients, so you have access to a server-wide NGINX User Cache purging function, should you ever need it. This is beyond the per-user clearing tool that exists in cPanel.
During the transition over to Apache+Cached NGINX, we conduct an auto purge per-account right at the end of the account-specific final works too.
Please let us know if you have any issues using TTT so we're able to help!