You do have to commit to camera brand though.
https://forum.affinity.serif.com/index.php?/topic/78025-when...
If they do make one, it may or may not have editing features built in (vs shipping you out to Affinity Photo).
But I'm in the same boat. Stuck on CS6, couldn't stand DarkTable, haven't bothered trying any other alternatives.
If you see something you want when you try the beta, please tell me!
I've been getting into photo editing recently, and searched online for a few hours to learn about the differences between the various options. From what i gathered, Luminar (which is a pay once for a lifetime license that you can have installed in up to five machines at a time) is a serious contender to Ps/Lr even at the professional level, let alone at the amateur/occasional user level.
It took a bit of getting used to (still not a fan of the UI and its obsession with "film rolls" every time I import something) but once I did it's quite nice. Images come out looking good and it has a handy Lua scripting environment and CLI with which you can automate many tasks.