In past it was because we were installing Tor Browser by default and because torbrowser-launcher does not support batch mode ( https://github.com/micahflee/torbrowser-launcher/issues/98) ( https://github.com/micahflee/torbrowser-launcher/issues/39). This isn't a reason anymore, we no longer install Tor Browser by default.
I am hoping it will be possible some time in future. I guess it needs someone contributing to it. At least reporting features we'd require for Whonix, maybe contributing code for it.
It doesn't work on Debian jessie yet - as you said - bug report link?
It doesn't support
--new-window --newwindow -new-window -newwindow)
--new-tab --newtab -new-tab -newtab)
tb-updater runs when running in Whonix a connectivity check, sees if Tor has already established a circuit. Maybe we could ask for a hole to run that code in torbrowser-launcher (by reading a config, by running plugin code).
Does it defeat an endless data attack [suppose due to some bug or hack file sizes get apparently 100000 GB] (like max download file size)?
Multiple languages support available or on the horizon?
Could it work in conjunction with tb-default-browser ( https://github.com/Whonix/tb-default-browser) (I can look into this if the other issues become clearer as well.)?
Could it work in conjunction with open-link-confirmation ( https://github.com/Whonix/open-link-confirmation)?
In case of emergency, could you jump in, fix any critical bugs or take over maintenance of it in case Micah gives up on it?