Their latest controller (v4?) removed the Flash requirement for both video (playback) and main (maps) IIRC. Do they still have leftover areas that require Flash?
ubnt has a habit of not finishing what they start. AirControl 2 is not finished and they're talking about Aircontrol 3. Airvision has been rewritten 3 times in 3 years.
For all I know they're doing Unifi 5 in pure flash. I wouldn't be surprised.