I think the main issue, and certainly from my own point of view was the A320 in (both versions) was working , and was working well enough to say for a new sim we can fly airliners point to point and it will go there.
What has happened since is just strange, with each attempt to improve things it has just got worse, to the state we are now in where the aircaft is virtually unusabel.
And what worries me even further, if MS?Asobo cannot get the flight model right, what hope have 3rd party devs.