The differences in functionality and basic performance between Windows 7 and 10 are minor. The visual changes are plus or minus depending on your taste.
The privacy discussion has been only slowly starting during the last weeks. Apparently some clever people have had time to read the Microsoft Privacy Statement and the Services Agreement. Thank you.
“We will access, disclose and preserve personal data, including your content (such as the content of your emails, other private communications or files in private folders), when we have a good faith belief that doing so is necessary to”, for example, “protect their customers” or “enforce the terms governing the use of the services”.
In other words they will have access among other things to everything on your hard drives, your private folders etc. The content of your emails and whatnot.
So the story begins to unfold and experiences will slowly cumulate. The people who are somewhat concerned, try turn off such problematic functions as Windows allows. The rest – apparently only partly known yet -remain.
All in all, the W7 works very well here, so no need of changes. Rather see what happens.
Btw let’s keep this topic at clean information level, no need to vote should you upgrade or not. And if you are already using Windows 10 happily, that’s good for you.