neb: Applications whose UI is so appallingly unintuitive or just plain broken that you have to resort to Google searches just to perform basic operations. Gmail and Signal spring immediately to mind. Problem is that a lot of the time all you find is endless messages from other people trying to find out how to do the same thing. And a Gmail specialty when you're looking for help is to carefully describe steps that haven't applied to any version of Gmail in the last five years, because UI Refresh.
This applies to 'free' image editing software that camera makers supply. It's all awful but contains the best algorithms for decoding the RAW files from that makers camera.
Licence the algorithms to Adobe and stop mucking about!!