1. There is no legal document in OpenStack that requires that. It was done intially to have a better rapport between the OpenStack board and Interop WG.
2. The Board member was useful to ramp up interop WG and get participation from vendors. We are at the different time in OpenStack maturity now.
3. The Board changed from OpenStack to Open Infrastructure with many non-openstack projects. So to have a board member on each OpenInfra project is not scalable.
4. Board trusts that 4 entities that are on Approval Committee adequetly represent Board view, since TC and Foundation staff for Marketplace are present.
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