One day we will find out what Windows 10 sends home too. Is it "only" ad tracking data like ads, or what several security advisors suggest it acts like a key logger?

The problem I see, a smartphone is me thing. A PC of your lawyer, your doctors is a hell another dimension. And unfortunately it's a group of jobs like these that run on Windows Professional often without an admin or AD server. Guess what, it's a wet dream for them.