I understand and respect your opinion, but I firmly disagree that Amiga is anywhere superior to an SGI.
You're looking at opposite ends of the same market: the Amiga was the low end of the market whereas the SGIs were the high end. I have an SGI Octane2, an upgraded version of the original Octane which came out in the later 1990s.
Maintained till 2004, the Octane2 boasts an UW SCSI bus with dual channels, up to 8GB RAM, up to 128MB V12 Odyssey graphics which are broadly comparable to a GeForce of the same vintage, built in 100Mbit Ethernet, a PCI-X cage, up to dual R14000 600MHz MIPS CPUs, which are as powerful as a low end Pentium 4 or a high end Pentium 3 alone.
The hardware of the SGI is well optimised and integrated, similar to the Amiga. They're broadly similar in architecture and the SGIs are still plenty useful for today. I would rather use it than a Windows computer with the latest in 3D technology because Windows makes me want to take sword and chop my own junk off.
My Octane2 is just as useful as a Pegasos II running MorphOS while many times as powerful due to being 64-bit, having 8 times the max RAM and an OS that's just as easy to use as MorphOS.