The thing is - Working Title was brought on as a 1st Party to MS-Asobo - specifically to solve the lack of features in the Garmins. That’s how they’re going to close the No. 1 Item on the Feedback Chart.
Before the 1st Party Partnership Announcement, Working Title was indeed a third-party. But no longer. They are effectively working on behalf of MS-Asobo - it’s as official as one can get without having a seat in Bordeaux or Redmond.
The effort to revamp the sim’s base code to fix the Garmins (and by extension the Flight Planning, Routing, Autopilot-to-NavUnit integration, and even some ATC logic) is a bridge too far.
So the solution is to fix it, NavUnit by NavUnit. Each NavUnit will override the above stated characteristics of the sim when installed. WT have already pioneered this with the CJ4 (which was essentially a proving ground). Next comes the G1000 NXi on the heels of Sim Update 5 and then eventually the G3000 and the G3X.
And the plan is to deliver it via MarketPlace, so it becomes ubiquitous and installation is no longer manual. It’s becomes as transparent and relatively effortless as downloading any official content from the MP.
Working Title is part and parcel of the future, without going into too much fanfare. You can choose to run the sim without it, but honestly, you are missing out on what the sim is supposed to be.