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Not supported rarely means not functional. If you need Citrix support at some point and they discover an unsupported situation they won't help you unless you upgrade.

Not entirely correct. They won't help except if you prove this is not related to the « unsupported layer ». In this example, you have an issue when hosting VMs on Vsphere 7. They won't support you unless you prove you have the exact same issue on VSphere 6.5. In that case, they will.

I have quite a few 2012 boxes that have no issues with vsphere 7.