Windows 10 and macOS are both safe and secure operating systems, both have vulnerabilities mostly exposed by the users. Microsoft is clearly moving more settings to the new UI, equally nor can Microsoft rapidly flip a switch given the massive corporate footprint the OS has. One also has to question if your living in settings, once set up I rarely visit settings in either OS.
Major problem with Windows is it's complex and offers the average user far too much control, hence why so many systems go haywire. If you understand the OS or don't meddle with it Windows rarely presents issue, there's good reason why the term PEBKAC originated...
Q-6
Nah.
The major problem(s) with Windows is forced updates on Microsoft time, their constant faffing about with the UI (3 major changes in 2 years since windows 10 release - not even including the Windows 7->8->8.1 fiasco), shoving mobile "touch friendly" garbage (that isn't, try using a surface with no mouse or keyboard, go on) on us, and sending usage data (and a whole heap more - some of it has been released, go look up some of the stuff sent) back to Microsoft whether you like it or not.
Never mind the total inability to figure out simple things like non-blurry UI scaling between different DPI displays hooked up at the same time, UI inconsistency, total lack of software QA, real world power consumption, malware, integration with other devices, bluetooth that works (or for that matter a single source of support for hardware vs. driver problems), etc.
Complexity and PEBKAC is the least of the problems with windows. The platform is a complete dumpster fire.
And i say that as someone who has been making a living getting paid to support it for 20+ years (and still is).