MickJoeBill:
"One of the reasons cabin lights are dimmed is to allow a clearer view outside to assess hazards, by eliminating reflections from the cabin.
The other reason is to allow eyes to adapt to dim light so crew or passengers can better see outside to assess hazards."
The cabin crew in summer routinely tell pax to close the blinds so the aircraft stays cool. Any blinds that are left open are shut by the first pax boarding so their view of their tablet/smartphone is not compromised. When the lights go off taxiing out for takeoff, pax are told they can switch on their overhead lights if they want to continue reading.
It would seem that the flight safety aspects that you quote are routinely disregarded by the aircraft operators. Ideally, blinds should all be open for takeoff and landing and no lights apart from dimmed guide lights illuminated in the cabin.
Flying these days is more like being in the cargo hold with people holding flashlights with big screens. The average pax have no situational awareness after pushback.