I think it better have to have assistive technologies enabled by default than disabled, but this seems to be a very common question. I can think of a few possible solutions - have a separate ISO with which assistive technologies are enabled by default during and after installation - have an option in the graphical installer to disable assistive technologies - have a pop-up on first log in to set accessibility options
For now, there is a documentation page explaining how to uninstall Orca. https://trisquel.info/en/wiki/disabling-orca-screen-reader I think it is better to disable Orca than to uninstall gnome-orca, because gnome-orca is a dependency of the trisquel metapackage. In fact, gnome-app-install will refuse to uninstall gnome-orca (and any other package that is a dependency of trisquel) unless the trisquel metapackage has been removed via Synaptic or a terminal.
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