A lot of these points seem a bit wrong, and are simply talking points

• Viruses.. Windows has UAC, its the same as Sudo. In fact, Xorg has some serious unfixable security issues apparently (Wayland fixes them). Malware like https://therecord.media/malware-found-in-npm-package-with-millions-of-weekly-downloads is the future.. Most users get malware because they install it..
• Safer files? Tell that to the BTRFS RAID guys.. MacOS actually handles this the best these days imho due to time machine (which does incremental backups). A lot of Linux Distro's don't even ship with an easy to use backup system, or anything as nice as Time Machine. Microsoft is literally at the point it is auto-recovering the OS when a fault happens.
• Fast and smooth? Apple beat Linux and Microsoft with accelerated desktop stuff by ages. Also, on my NUC 11 Enthusiast, I couldn't even get the ARC working.. Accellerated video is still somewhat iffy in some scenarios on Linux it seems.
• Flexability? Yeah.. Too much flexibility. We've got so many distro's which are basically just copies of other ones. And I'm still looking for an easy, low risk alternative to Magnet in MacOS (which kills PowerToys FancyZones or the KDE Tiling stuff)

That being said, if there was GOOD android integration baked in, and Android App store baked in, it would actually make a huge difference I think. Because thats the competition..

Waydroid still has some major issues unfortunately.

This would bring in lots of high quality apps (including ones missing like Whatsapp or Messenger), and ultimately do what Steam for Linux did for Linux Gaming.