I use Darktable a lot for 10 years.

It has improved vastly over the years. I love the new additions like AgX!

However I tried out the new AI denoise and it still isn't great. I also wish there was a way to manually correct barrel distortion (eg for vintage lenses) -- currently it only supports embedded metadata or lensfun profiles.

I also find the OpenCL implementation to be rather slow. It would be better if it were something more modern like Vulkan.