Coming from an enterprise admin that specializes in Windows deployments: the 5 year support of LTSC 2021 makes no sense to us. We aren't concerned about the alignment of its support schedule with Office LTSC. We don't even use Office on most of our LTSC deployments. LTSC 2021 will go end of support sooner than LTSC 2019 will. So it makes sense for us to continue deploying LTSC 2019 for as long as we can. This includes on VMs which we will have no way to deploy LTSC IoT on due to the licensing of LTSC IoT. Also the complexity of the licensing of LTSC IoT makes it virtually unobtainable. Microsoft's decision of making LTSC 2021 only have 5 year of support just goes to show how Microsoft is out of touch with its enterprise customers.