It is much easier to create large numbers of cards on desktop than mobile. There are also a large number of third party add-ons available for desktop https://ankiweb.net/shared/addons/
It is actually much easier to use a desktop browser as well. Yet, most traffic now is mobile.
Flashcards are a mobile usecase, I actually think a desktop version is actually limiting for them...maybe that's why Supermemo never became a roaring success.
However, I daresay that this is a usecase that is tailormade for the mobile rather than the desktop in any which way.
I wonder why the core team is spending effort behind a desktop app, rather than go full mobile.
[1] https://archive.wired.com/medtech/health/magazine/16-05/ff_w...
[2] https://www.supermemo.com/help/smalg.htm#Anki_will_work_grea...