What are your least favorite things about the requirements software you currently use?

My father has been working on a pretty incredible software tool for requirements for close to a decade now. He doesn't have reddit or social media, but he asked me if I could make a post to ask about any issues you are facing with your current requirements tools. I know it's something engineers really don't like to do, and these tools are often lacking and don't scale up to real world industrial size projects. He is doing his best to try to make the process as easy as possible for engineers and it's kind of his magnum opus as he's poured his heart and soul into it. Any feedback or suggestions would be so greatly appreciated.
Thank you reddit!!