For the record, modern mainframes are not for luddites. They can run Linux natively and they have a very advanced hypervisor that you can use for Linux as well.

For the record, modern mainframes are not for luddites. They can run Linux natively and they have a very advanced hypervisor that you can use for Linux as well. As far as I know, IBM invented virtualization back in the 70s and coined the term "hypervisor", and they've been continuing to innovate in the field since then. zOS itself feels dated because of the 3270 based interface that you use to interact with it and the fact that a lot of esoteric languages are still used heavily, but the OS and hardware are both cutting edge on the inside. Node.js, Swift, Java, and Python 2 and 3 all run on zOS nowadays.