In case anyone is looking to ditch Lightroom I can't recommend the FOSS alternative RawTherapee strongly enough. It's got a number of features I now find indispensable. I particularly find it easy to use to get that nice rounded off highlight quality film has using RT. I made the swap years ago and have never missed LR.
This was entirely unusable for me. RawTherepee is only for RAW treatment/export. Digikam can only do photo organization. Now here's the kicker: the two won't talk. Metadata known and written by one is invisible to the other. Using Manjaro, Rapid Photo Downloader eventually started segfaulting on me.
I also tried Darktable which looked much better and much more like a Lightroom replacement, but didn't like it.
So back to Lightroom, and even Windows as a whole, it is for me.
One thing to keep in mind is that Manjaro, similar to Fedora, is bleeding edge. Things break sometimes when running Manjaro or Fedora. That's the nature of a cutting edge distro.
The good news is that things that break are often quickly fixed.
They weren't really in your favor with the old model either. Adobe used to pile on new features without thought in an attempt to sell upgrades every other year. In the mean time bugs would continue to exist from one release to the next.