I guess it depends on what the definition of “lock down” is. In our case I’d say the definition is to lock it down securely from hackers.
In your definition you mean to lock it down from communicating to Microsoft servers.
I think our definition of locking down your PC from hackers is a very good idea. However, I think it’s possible to block Microsoft telemetry to the degree that it actually causes new and different security issues for you.
For example if you accidentally block Windows updates I don’t think that’s good.