Tight on topic, Trent XWB for A350 was unacceptable for Thai. If it wasn't financial reasons, it it tech problems? The XWB didn't show any after i spent some searching, it's just Emirates complaining about the short of wing inspection cycles. Dont know if this is out of caution and could be extended in future.
Other latest RR models seem to have no operational issues, with the exception of 787 Trent1000 and its IPC and IPT blade issues.
If Thai aims for 787 and the GEnx, are these safer?
2x Shaft cracks, but found pre-delivery. Don't know if a permanent fix was found.
1x icing issues with damage in flight, but sorted out meanwhile by design change. both also happened on 747-8 in operation.
Haven't found the Generator Gearbox issues brought up by tdracer. But I believe its real, and resolved.
Any other restrictions on the 787 GEnx?
If they aim for 777-X, a whole new set of uncertainty lies ahead of them. But that's not the plane to look for if you originally wanted A350, right?