I'm a regular user of Darktable for several years and I wouldn't call it a 'user-hostile' project, but the impossibly tiny controls for some functions is frustrating. Maybe they just need more UX experts to pitch in and help improve the product? This is certainly a common theme with FOSS.
Overall I get excellent results with the software, I like it and I'm pretty quick in my workflow, but those little triangles you have to right-click on (e.g. to adjust the exposure or black point) take me multiple tries. Every. Single. Time! My fine motor skill is great. And I'm using a good quality wired mouse because I like the precision.