Hey @DonalB,
In my opinion is not required at all as for example we use VVD 5.1.2 without having Skyline Collector and is still on the documentaiton. Take into account that VVD are baselines and best practices for having the products up-to-date and maximizing the utilization that the products can provide.
So if you are planning to do an update, go ahead and do it by following the standards but remember that you won't need to integrate with VCF.