Confusion about when it's my navigation, and when it's ATC

Recently, Mxsmanic posted:

TxSrv writes:

You are missing the point that MSFS does not model, nor need
it for the vast majority of sensible users, the forced
(slewed) behavior of a 172 in the high flight levels be
real.

Without testing the aircraft at that altitude, there's no way to
verify the MSFS modeling of the aircraft at that altitude.

If the real aircraft can't get to a FL, *any* representation of the
aircraft's behavior at that altitude is incorrect. The only correct
modelling would be to accurately represent the aircraft's behavior at its
service ceiling.

Neil