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For what it is worth I have tried the spreadsheet below which should help you to size your environment based on the amount of VMs you will be running and the disk policies you will be using
It is very comprehensive
It also takes vSAN workloads into account even though it says 6.6 it should work for 6.7
There is a vSAN sizing tool available from VMware: https://vsansizer.vmware.com/
In the tool you also have the possibility to import an RVTools feed, or you enter the average usage values manually.