I don't really have things in my job or intellectual pursuits that clearly lend themselves to flashcard style memorization, so I've been doing SRS on sort of quasi-useless things to help 1) get in the habit of SRS and 2) build more "scaffolding" in my memory so when I want to SRS useful things it'll be easier.

(By (2) I mean I'm memorizing some historical dates/facts because I found early in using SRS that I'd traverse known facts like a graph, so simply having more known facts would make it easier to add and remember new ones -- most things I'll learn will have a date affiliated with them, so figure anchoring a bunch of dates in my memory won't be totally useless)