Neil Gould writes:

If the real aircraft can't get to a FL, *any* representation of the
aircraft's behavior at that altitude is incorrect.

Not so. The aircraft could be placed there by another aircraft, in
which case it would have some sort of behavior that presumably could
be simulated. It just can't get there under its own power. Slewing
functions in a simulator are the equivalent of carrying the aircraft
to that altitude in real life.

Thus, while there may not be much practical reason to simulate the
aircraft at that altitude, since it is physically possible for it to
be at that altitude, it is also possible to simulate it at that
altitude. However, if nobody ever tests the aircraft for real at that
altitude, any simulation of its behavior there remains a matter of
speculation and unverifiable.

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