It's better than OS/400/i or the mainframe OSes, so be happy, I suppose...
I just bought an as/400 running os/400. password on the machine, and the machine turned out to be leased, it should not even exist still, so no chance of getting licenced software for it.
I found a copy of irix install media for sale and had my octane up and running within a week. the support and software released here are amazing. at least you can still get help and modern software ports through the forums here.
the as/400 is a doorstop without software. looks nice next to a crimson though with bits of red on the front cover though.