I read this all in details many years ago as I work with CATIA quite frequently.
The dumbest mistake was trusting the Americans/Reagan/GE in the 80s with powerplant selection...given
a) 1971/Nixon/Kissinger (and India inflicting a deep hurt on them that Carter could not/did not reverse that...
There are challenges for sure, but there is lot of RnD going on so we shall see what comes of it.
These same type of challenges and some pessimism (in say the 80s) existed regd technologies in today's turbofan that are now matured and taken for granted.
Also when we talk military domain, there...