Yes good point. But my needs are very limited. On macOS I use the Photo app to cull, make small adjustments, and crop. On Windows there is also a Photo app that allows such basic features. They both works with RAW and works fine with my NAS mount in smb to cull directly the files (though macOS is a pain for that, doesn't play well with files, need to import in lib).

On linux, the default Gnome image viewer is nice but you can't make adjustement and when deleting a file, the file is not remove from the NAS directory (need a manual refresh). With Gthumb it works for deleting files but the crop tool and the overall app is not as nice. Anyway I'll continue to look for my perfect app or for the default Gnome viewer to update its features (I think it is in active development)