Between this, and manually uninstalling a lot of bloat (or using a specific type of windows install) and a few other tweaks, windows becomes significantly more usable.
Disabling garbage in the task bar, removing Cortana and indexing services, etc etc, it can also add a fairly decent uplift in performance.
I’m sure there is still telemetry being collected but significantly less and less impact on my user experience and day to day performance.
Oh and make sure you turn off auto/feature updates!