Is it wrong to hate the era when one is living?

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Nothing wrong with hating this era as long as you are willing to do something about it.

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SkydustMemory wrote

What are you doing personally?

Both of my main projects are a rejection of modern culture.

http://www.arkian.net/
http://www.reactionary.software/

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Why do you want to write an OS?  The Mac OS that I use works and is still tolerable.  I can think of a lot of software that is in much worse shape.

That said, I think a Java-based OS would be useful.  I would look at TempleOS for inspiration.

I agree, post-2000 is when things really became intolerable.