If I use Nginx for secure connection, Focus user is not use for create room. So all users are in separated room, and I can’t invite other user (Your conference is currently being created…).
If he has another websites running on same sever, he can’t give 443 exclusively to openfire. Also, if he is using letsencrypt, it is easier renew certs and reload nginx with just 1 line in crontab. Openfire uses that keytool stuff to handle certs, that is more complicated I guess.