pattern_is_full
Disclaimer: Not PP (not for 30 years at least) but ATC and flight procedure designer.
While an extra 50m on the take-off run might not faze you, I would have thought even that extra 2% would start to worry you in a OEI situation. That margin between the book climb rate figure and the 1.6% contingeny surface (only ~100 ft/NM ) starts to get pretty thin doesn't it?.
We already have (or had) problems with ULH brand new generation large twins unable to take default SIDs under common temp/pressure conditions for our location due to OEI issues.