Boeing had a good article in their Aero magazine a few years ago and said if you took off from a runway and met all the performance limits you can land on that runway and meet all the performance requirements.
the big thing is if you takeoff , lose an engine and have to return for landing...if your weight is too much to allow a safe go around on remaining engines, then you have a problem...and that problem is dealt with by dumping fuel.
Think about it, you were able to accelerate to V1, lose an engine and meet the 2nd stage requirements. During an engine out go around you're already ~V2 at the end of the runway and a couple hundred feet above the airport.