Well that did not age very well 
Why not just getting the stuff that is working right in SU1 Beta out the door and move things that are not towards SU2?
What is the point of delaying fixes for airplanes provided by 3rd party Devs weeks and month ago?
It is almost 3 months since the last major update, and almost 2 months since the last minor fix released. Assuming your where confident that the Sim was in good condition on release date it should not take so long to get a SU out to the public.
By just releasing fixes sooner than later might take a bit steam out of the system. By further delaying bugfixes until a specific scope for SU1 is meet does not make sense in my point of view.
Lets be real, the last update notes contained 2 lines.
Does this holding the SU1 back?
Or is it this one?