I think it would be a cool thing to consider. It is distro-agnostic so instead of supporting distributions of Linux individually, you would only need to support one platform.
I think the major advantage of using flatpaks with regards to anki is that the application would be sand boxed from the rest of the system. Maybe this would be ideal considering the fact that anki has addons. Some of which may be malicious. Supporting flatpak would mean these addons won’t have complete access to the host system and be restricted.
I also understand if this can’t be considered a priority and there are probably far more important things that matter. The app has already been ported to flatpak by a third party but it is version 2.1.15. I was just thinking an official up to date version would be cool
Although it wouldn’t matter anymore if you can use the flatpak. The flatpak version was made in a way to respect the GTK theme but it seems as though that is no longer the case with the new update. Maybe it is because I’m not using adwaita but I’m not sure.