What OS do you think would have the easiest time transitioning to your own ideal OS? Meaning if you had complete control over it, you would need the least changes to it in order to make it idea?

My vote is probably for windows, if you got rid of the bloat/ai/telemtry and cleaned up some of the legacy control panel stuff it would probably be the best OS, there is too much bullshit from the UNIX days that has carried over to make it a viable operating system for the future. In 100 years we will not be using UNIX, and will probably be using something more like the NT kernel