Update: while we still don't have any strong feelings either way, and still definitely quirk a brow at exclusionist language of any sort, there does seem to be some level of reasonable discussion on the topic. There's a tumblr post by (we assume?) the person who coined the term actively revoking it, asking for people who would use "kff" to instead use "cir" (character I relate (to)). There's also notes about how damaging the tumblr "kin" community was to plural, otherhearted, soulbonders, etc. folks (which we agree wholeheartedly with, tumblr was a cess pit!). At the moment there seems to be only one person with active resources (or even just general links), and said person is someone we'd normally be quite suspicious of. They also actively denounce many of the plural resources available in favor of some small ones we've personally seen use exclusionary terms and the like. It's all very hard to wrap our head around, especially with so much history for kin/plural/soulbond/etc. having been lost to time (LJ)! 📚​