Speaking as a maintainer of Whonix GNU/Linux which is a derivative of Debian GNU/Linux. Its focus is on anonymity/Tor.
Having a dedicated user support forum for Whonix and teaching Windows users who use a Debian derivative for the first time in a virtual machine the most basic things eats up a lot time. And is a lot duplicate effort. Many of those questions can probably be answered using the search function of this website.
For basic questions, such as "how to use apt-get", "how to install a package", I would like to recommend Whonix's users to use unix.stackexchange.com. And also recommend, if they open a new question, adding the tag "whonix" (if that is ok).
For general Tor/anonymity questions I would like to recommend Whonix's users to use tor.stackexchange.com (after asking tor.se if that goes okay as well).
whonix.org's own forum would stay open for questions not suited for the stackexchange format (opinion based, feedback, discussion).
I would myself subscribe to questions having the tag "whonix", and answer if no one else was faster and/or comment if I feel necessary.
Would you be happy to welcome Whonix GNU/Linux users on unix.se?