Nomen Nescio writes:

Uh, gee, Einstein, a real rudder DOES control flight path.

Sometimes it does, sometimes it doesn't. It rotates the aircraft
about its yaw axis, which can have a number of different effects,
depending on the situation.

There is in MSFS. There isn't in real life. My guess is that MSFS merely
uses a random number generator to add a degree or 2 of bank or pitch.
Real turbulence can throw a plane up or down a few hundred ft in seconds.
Turbulence in MSFS has NO effect on altitude.

It does when I encounter it.

One of the reasons is the useless rudder modeling.

No, I think the main reasons are that some pilots depend excessively
on physical sensations, and become disoriented without them. Also,
some depend a lot on a large field of vision, which most simulator
configurations don't provide.

Here's a test you can do yourself.
Fly straight and level.
Look at your heading.
Now feed in full rudder (pick a direction) and hold the wings level (this
is critical).
After doing this for couple minutes or so, release the rudder. Again, always keeping
the wings level (any bank at all will screw up the test).
Now look at the heading. If you did this perfectly, the heading will be exactly
the same. Now check your flight path. You'll see that it's a straight line.
With a real rudder, your heading will change significantly and your flight
path will not be a straight line.

I did it. The plane turns (reluctantly), and the flight path curves.
The heading changes. And the wings were level, because I turned on the
wing leveling function in the autopilot, which forces them to stay
level (it was using quite a bit of aileron to keep them level, but
they did not budge).

So MSFS apparently passes the test.

BTW, The rudder responses are reasonably accurate in "x-plane" so
there's no reason MSFS couldn't model it properly. But that does not
change the fact that it's not.

It seems to work fine on my copy of MSFS. Rather like your rudder
test.

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