I agree to your summary.
I was considering this being "open" so long without being a major issue for 
anyone combined with the required work getting bigger to implement/fix it for 
real. So of the two choices:

a) having the error statement while trying hotplug be improved saying hotplug 
is not supported with that version of qemu/libvirt
b) bring in all the necessary changes required for vcpu hotplug in xenial 
aswell.

b) imho seems like a rabbithole of changes and even potential regression for 
more important cases. Especially that there is an LTS released where things are 
fine (18.04)
a) seems to be less invasive and the right situation given the situation.

Therefore after that being "selected", would you mind prepping a change
that you'd want us to add for that improved message when people are
trying to use Hotplug on Xenial?

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https://bugs.launchpad.net/bugs/1709877

Title:
  CPU hotplug fails in the system with empty numa nodes, "Invalid value
  '0-1,16-17' for 'cpuset.mems': Invalid argument"

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