This don’t indicate unless someone will benefit.
Turns into something even lazier than not looking. It doesn’t turn into they are checking for others first. It turns into they haven’t looked and they haven’t indicated. Not only are they not aware of who may be impacted by their manoeuvre , but those around haven’t even got a clue they might be about to make that manoeuvre.
But the looking , oh no one will be impacted, fails on the massive blind spots in motorised vehicles. Given the blind spots it’s a bit of an assumption that if you can’t see another road user, they can’t see you, or won’t be impacted.