It's been a while since I looked at DarkTable. I stuck with Lightroom because of the camera + lens support and a large number of time-saving export plugins. I have a family and a job and limited time for my photography hobby. Anything that speeds up the workflow adds value. Take a look at the rest of Jeffrey's plugins.
NOTE: I did the whole Linux desktop thing in the early 2000's. I was actually a member of the Linux User Group in Princeton and developed web apps on Linux for decades (built my first Linux server in 1994). Circa 2007, I realized that I could have a hardware and software supported desktop OS and all the goodness of UNIX/Linux by buying a Mac. Not a hater. Just a pragmatist. I still use Linux for all my websites.