Decks had accumulated weight: grammar points carried notes as well as cards, and some curated entries no longer pulled their weight.
ADR-0085 slims them. Grammar is taught by cards only, so the grammar packages carry no notes. The deck headers that showed review-card counts were reworked to match, and a batch of curated words was dropped and the decks regenerated.
Deck size isn’t just download bytes. Every entry a deck carries has to be resolved at startup and projected into the review queue. A smaller deck is a faster launch and a cleaner queue, and a note that teaches nothing is not a small optimisation. It’s dead weight the learner loads every time.