The previous Tigervnc versions had a wrapper script called vncserver
which
could be run as a user manually to start Xvnc process. The usage was quite
simple as you just run
$ vncserver :x [vncserver options] [Xvnc options]
and that was it. While this was working just fine, there were issues when users wanted to start a Tigervnc server using systemd. For these reasons things were completely changed and there is now a new way how this all is supposed to work.