In reviewing the VCF 4.x Ops and Admin Guide, there is a section for "Expand a Workload Domain", which includes a management or VI workload domain.
There is also a section for "Shrink a Workload Domain" which references only Workload Domains. Does this mean you cannot shrink a management domain
by removing a management domain host, even if that leaves you with the minimum of four management hosts?
You can remove a host from the management domain.
I've also submitted feedback to update the documentation to include "management workload domain", as the 'Expand a Workload Domain' actually mentions the management workload domain.