I’m OP. Thank you for the feedback!

Yes, I think decks have to be personalized. But I don't agree the argument that "writing out in pencil then transferring back to a Spaced Repetition Software" is better than "pre-made selections of reading material". For Incremental Reading, you have to select the important parts; there's no pre-made selection. It's just like highlighting; the material isn't pre-highlighted. I think the most important thing is the thought process: thinking which part is important and which isn't. The medium, whether you are doing it in paper and pencil is no difference than doing it digitally.