Reading the first post I don’t understand why RawTherapee isn’t in the equation.
The last two years I’ve been dabbling with open-source options to LR/PS. I’ve tried darktable extensively. Heck, I even think I finally get Filmic RGB. 
The fast development of darktable inspiring. And while there is a lot of power to be found in the scene referred modules I have also found them to be quite complicated for what I can achieve using them. Having worked as a full-time retoucher for close to 10 years I’ve come embrace tools that helps me reach the results I’m after as fast a possible. Sometimes I feel like darktable’s complexity almost becomes an end in itself.
I recently gave RT a serious go again and I must say I have such an easy time getting the results I want. In many ways I felt that this thread kind of summed up my experience with RT and darktable. Users are fighting to get good results tweaking darktable and then an ART user comes by and pulls off excellent results with not much effort. It should perhaps be added that I’ve found highlight recovery in darktable to be an Achilles heel, so it might not be the best example.
A raw converter without local adjustments is unthinkable to me, but local adjustments will be landning in RT 5.9. Some people complain about the near infinite scroll that all the different tools in RT introduces. Having collapsed the ones I don’t use, quite literally, I don’t see the problem.
darktable is awesome and vkdt will be expand on this awesomeness, I’m sure. I’m just saying, don’t count out RT. It’s quite excellent (and will be even better when LAs land). We should be happy to have three (or more!) very complete open-source raw converters.