Thank you for your reply. While your logic is certainly sound, I've never read anything in the "VSAN 6.2 Stretched or ROBO Cluster Guide" that states the Witness needs to be highly available. It was my original intent to deploy the Witness for any one of the 3 VSAN clusters to either of the other two but was told that this was unsupported. That being the case and assuming operational feasibility, it does make sense to have a second "spare" ESXi host to take on those Witnesses in the event of a hardware failure.
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