I've been rummaging online to find any history of firmware updates, to check out any added features, bug fixes, etc. Are they all listed on a universal page I'm simply missing?

You can download the Mavic Air release notes here:
https://www.dji.com/mavic-air/info#downloads

Hello and good day EShaver102. Thank you for the inquiry. You may check the link that msinger provided on reply #2 and you may also use this link as well to check the history of the firmware updates for the DJI Mavic Air. If you have any other inquiries. Please feel free to post it here at DJI Forum. We are here to help you. Thank you.

https://dl.djicdn.com/downloads/ ... ant+2+Release+Notes(1.2.4).pdf