Disable the first run screen in GNOME software, which invites the user
to browse and install apps. We do not want people to use GNOME software to
do that when they open it for the first time in postmarketOS after
installing, we want them to do updates. So this dialog is misleading for
our users, and will lead to a bad experience for those who follow what
it suggests.

I think there's more wrong with that dialog (in context of postmarketOS),
more detailed reasoning and screenshot in:
https://gitlab.com/postmarketOS/pmaports/-/merge_requests/1449#note_385456592