For those of you on Discord and joined the Working Title server, you can see the latest conversation starting around this message and scrolling down.
Challenges:
G3X development would be enormous and costly - perhaps larger than all of the Garmin work to date combined.
G3X requires still a navigation unit and an AP panel, which is missing on some aircraft that came stock with the unit.
And there are other reasons and implications - you can check it out for yourselves.