I can certainly file this as a feature request for you, requesting that export to Avenza Maps can be a multithreaded process. I have attached your name and contact information for this feature request, so if there are any updates or questions we have, you will be notified.
If you have any further details you would like included in the request, or any other questions, please let me know!
Adobe released an update to Illustrator 2021 (v25.3) that includes native support for M1 Devices and Rotate Artboard functionality. Please note these features are not yet supported within MAPublisher at this time. See compatibility notes.