The advantage with sentences comes when they are made in a +1 manner (only a new concept per sentence) . That’s wether vocab or grammar.
The benefit is that with each new sentence you’ll be using already known concepts and learn a new one, so gradually you put to use new knowledge while reinforcing previous one.
The Jalup website has several decks that works in this manner, and there’s theself made version I do as well .
People doing sentence mining usually catch sentences on the go … But of course that means immerse yourself in the language and be aware of +1 sentences you find on the go as well.
WK sentences don’t work in this way (besides they don’t have any way of knowing your grammar skills)… I imagine that would require a mayor overhaul in the current sentences.