This feels as if it deserves a write up, did not know that they migrated from Python to a primarily Rust backend. Would love to know the why/what from the team.

(Anecdotally, Anki has seen a huge quality increase in the past couple of years.)

Most def. It's ALL Rust underneath, the PyQT gui (on desktop) is basically a legacy compat layer, mostly because they need to support vast amount of add-ons, and the editor is quite complicated piece of UI.