As previously mentioned the aircraft still has to be operated and while a visual lookout is extremely important, it can't be done 100% of the time.
Care to explain that comment?
Commonsense tells us that is correct as evidenced by a Single Pilot aircraft....at some point you do have to look inside and take care of business....but then you look back outside.
In a Three Crew Aircraft....why can one of the two Pilots (preferably the one handling the controls or tasked with controlling the flight path) not be left free to look outside at least similar to that of being a single pilot in an aircraft?
Are you advocating it is just fine to just not look out if you have something to do that takes more than just a few seconds?
How long do you "not" look out at a time and think it is safe to do so?