I fly around a fairly limited part of the world but my experience with the MCDU and the world map planner is that they have exactly the same problems. In general I find it helps to only plan to the first waypoint of the STAR, ie the transition, and sometimes I have to build the STAR manually. Approaches often force an unrealistic “VIA” and also have to be built manually. Often the ILS approaches will include a DME arc if there is an arc with the procedure and won’t allow commencing the approach from any other waypoint. My work around for this is to just build the approach manually and enter the frequency manually in the RAD page of the MCDU.
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