I have only tested and used Whonix on Qubes where this is unavailable. How prevalent is non-Qubes usage of Whonix actually?
Our current stance on Whonix is:
Whonix is best used in conjunction with Qubes.
Maybe it is actually better to say this is the only way we recommend using it, and YMMV for any other form, including this one.
On the other hand, if people think this live mode is beneficial it could be worth recommending and it would be the first legitimate reason to use Whonix outside of Qubes IMO. However, I am not sure what benefits this live mode would have over the disposable anon-whonix VM in Qubes.
I am extremely unconvinced this should be used for anti-forensic purposes because Whonix still requires a host operating system. When/if Whonix-Host becomes a thing maybe it would make more sense. If anti-forensics is the only real use-case people here want from the live system though, then yes I would recommend a stance against using it.