Spaced inbox review should not be completionist or obligatory
Seeing the number of cards that are due in Anki feels oppressive... like, "i have all these cards due and that means i'm not even meeting the 90% retention rate!!!" or something. and who knows, maybe this kind of oppression is actually a good thing for knowledge retention (though I doubt it). But it's totally the WRONG mental state to be in when you are trying to create new ideas, which is the whole point of having a spaced writing inbox. Spaced inbox review should instead be going like "given that i have such and such limited amount of time to review, what are the BEST NOTES to be spending the review time on?" It doesn't matter if there's a ton of other notes you haven't reviewed in a long time -- you'll get to them eventually, and if you ever recall them, you can just search for them yourself and build on them.