I am creating an operating system (a real project not just basic) and I'd like to receive feedbacks for new features you'd like to have in an OS (or problems you have with Windows, MacOS or Linux)

Hello everybody out there. I'm doing an operating system. This has been brewing since november, and is starting to get ready. I'd like any feedback on things people like/dislike in other operting systems, as my OS resembles them somewhat. This implies that I'll get something practical within a few months, and I'd like to know what features most people would want. Any suggestions are welcome, and I'll do my best to implement all of them :)