Commercial decks, where the deck maintainer is paid for his efforts, make a lot of sense.
And I suppose if they are making money out of the ecosystem, it also only makes sense that commercial deck makers make a contribution to the technology that makes it possible. I suppose I would prefer that be a contribution rather than ownership and custody, but I suppose Anki's license terms (it is AGPL3+ - I think without a CLA) prevents them closing it.
So cautiously optimistic
* exclusively quiz entire sentences
* introduce around 500 new words (a nice mix of nouns, verbs and adjectives)
* use a wide variety of grammatical constructs (including all conjugations of the new verbs),
* and that have audio of a native speaker reading the entire sentence after I "flip" the card
Such a deck needs to be thoroughly designed, and while I could choose the new words and then write software to make sure they are all used equally in sentences and no conjugations are missing, I actually can't easily make sure they are correct and I can't record the audio of the text.