Earlier quoted context omitted.
Because those open-source editors are made by coders, not photographers. Those tools you really need for properly edit raws are hidden in blated features (multiple demosaic algorithms) or completely missing (AI masking). And UI is not user friendly.
They are made by and for photographers. This software is designed for many use cases, not just creative photography - hence multiple demosaicing algorithms. AI masking is missing exactly because it's made by photographers - they don't have the required expertise. UI is not intuitive because a) it's designed by photographers' committee, not UI designers, and b) you are familiar with a completely different workflow.
Please explain why photographers need 20 differnet sharpening methods, 5 demosaicing algorithms, many colour corrections that are almost useles if AI masking is not present?
Coders often lost in all kind of geeky features that missing actual usability by targeted audience. Bloated software is not what I would expect from alternative to commercially used proprietary software.