I know you can manually adjust the fuel to dump on a 777, but the pilot normally hasn'tvto use that. A 757 has no fuel dump, so can land at MTOW. (I know procedures and certifications can differ, but the gear is strong enough to take the MTOW on landing).
Now still, if anybody can explain that approach climb to me, and why we have to check gear struts if it isn't the overweight that decides if a jettison system is there or not.