[kube-system]

Individually, sure. But in an organization, the larger it is, the more probability that all of the features are being used approaches 1. Then you don't have a software issue anymore, you have a business workflow, retraining, or retooling issue.

[v5v3]

Most admin staff don't do anything complex aside from writing letters. They don't create complex docs with table of contents and images and so on.

I have worked for companies prior who gave basic online office 365 to 99% of staff and then more expensive subscriptions on a as needed basis.

[kube-system]

Using multiple tiers of the same application is a good strategy.

And using partial MS Office and partial LibreOffice is also certainly an option, but whether it will be successful depends on an organization's workflow, because that introduces an additional interoperability risk which isn't an issue if everyone uses the same tool.