I would suggest that if your desired metric is anything remotely like "total number of trivia facts I can recall easily from a suitable prompt", then making Anki cards is obviously a better use of your time than reading more new articles. And extremely superior to making your own spaced repetition system. (That might change once you've used Anki enough to have identified shortcomings. But don't let daydreams of perfect systems prevent you from moving from a bad system to a good one.)