Just my take on this...
The software business is changing to more of a membership/subscription model.
If that helps with development/stability for these companies... we benefit.
In the world we live, there's a lot of "gray area".
I guess you can choose to avoid it... or to navigate thru/around it.
The privacy issues with Win10 can and will be worked around.
With a USB WiFi adapter, it's quick/easy to connect/disconnect from the Internet.
This does't resolve all privacy issues... but it's a simple solution to prevent automatic-updates, etc.
As for having access to your personal data:
Jarrod the Subway spokesman gut busted for (horrible) things he shouldn't have been doing... and they grabbed a bunch of evidence off his computers. They would have gotten that information regardless of platform/OS.
Fear or at least "distaste" of the unknown is somewhat human nature.
Remember Y2K?
Some thought the world would come to a grinding halt.
On Jan 1st 2000 at 12:01am... the Earth was still spinning and it was business-as-usual.
I suspect we'll make it thru Win10 and beyond.

There will be "speed-bumps", "road-blocks", "annoyances", etc... but we'll move forward.
"Same as it ever was... same as it ever was..."
"Meet the new boss... same as the old boss..."