So far I haven't managed to turn off the firewall scare popups, I did manage to remove that crap in the task bar that pops up the weather and selected news covering half the screen if you hover in the wrong place, I may or may not have turned off the OneDrive upsell, and I also got a full screen message to upgrade to 11 for free when booting once.
Great user experience overall. And don't tell me I can spend another week to turn those off, is Microsoft paying for that wasted time?