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Yeah, agreed that QKSMS is a problematic app for that reason. (There was some activity on their "pre-release" on Jan 16th 2023, but I agree that it's not too promising)
One thing I struggled with though - is an out of date SMS app really all that much worse than the SMS protocol itself? My understanding is that the SMS protocol is so badly vulnerable / compromisable that using it at all is a huge security vulnerability, regardless of the app.
My position is: I'm unwilling to abstain from using SMS entirely (too many contacts use it exclusively, I don't have the social capital to cut those off or make them switch to Signal), I dislike the AOSP messenger aesthetics, and I hope to avoid using google software on principle.
Given those, I chose QKSMS because it seemed to be the "lesser of the evils".
I have not tried @thompson's other recommendations though (Molly, Partisan, Simple SMS).
I'd be open to trying other apps / rethinking my approach too.