That's true 'bloggsy' everything is predicated on the 2nd segment (the worst case) but it's interesting to watch the A380 takeoff at heavy weights they seem to stagger into the air & climb the same as a C150 on a hot day! Optical illusion obviously but I'd hate to see one of the ugly beasts lose a donk out of Melb on a 40 deg day...eeeekkk!
I guess it comes down to just how 'safe' are 2 eng's compared to 4 (or 3 for Eg)
'Safe' is subjective, safest is to stay in bed & never get up!:-)
Wmk2