The OS4 that I had on my AmigaOne offered nothing and not sure whats changed.
...
Why are people waiting for companies to make an Amiga OS?
...
I am still scratching my head to see what the Amiga can offer apart from nostalga.
...
Fun things to look at:
http://meos.sourceforge.net/
http://haiku-os.org/
http://www.syllable.org/
http://www.dragonflybsd.org/index.shtml
For exactly the same reason that you question why to make AmigaOS or who has a real use for it, I ask you why make any of those OSes, and what use would I have for them? I've never heard of them, and don't know why I should care if they exist either. Please give me a compelling reason why, considering that don't see much reason to be interested in AmigaOS, that I should look at these other OSes you listed. How are they in any better position to go anywhere or do anything than AmigaOS is?