OK so on a basic level yes it was perfectly flyable, other than not wanting to climb at any decent rate above 10,000 ft. But in the online world of vatsim, to not be able to fly direct or make any changes at all to the flight plan yes did make it unusable, if that is a better way to describe it.
But even flying offline, to not be able to change a flight plan without the plane turning back to the airport would get pretty tiring.
Apologies I will choose my words more carefully in future.