Originally Posted by bearfoil
Why on Earth develop an engine with X Thrust, then derate (make unavailable) its Power??
Perhaps you should ask RR plc. I suspect it's just marketing strategy. The market is willing to pay a certain price per pound of thrust, so the lower rated versions probably have a lower price tag, as well as lower maintenance costs. The higher rated versions provide 'growth potential'.
EDIT::
a hurried iteration with a new Data Entry Plug.
Any proof of that? It is not the first engine that RR has developed, nor the first application in a new airframe. Ever heard of a completely new airplane that didn't turn out heavier than planned?
regards,
HN39