• I spend a fair amount of time on Zoom calls (who doesn't?), and I like to use my Apple AirPods so I can move around while we talk. I was never was able to get these or any other Bluetooth headset to work on Ubuntu. They pair only as headphones with no microphone. On Windows they work "out of the box".
• I use a triple-monitor configuration with three 4K displays: the ThinkPad's internal 15" display and two 24" externals. In Ubuntu I can only get two displays to work. (BTW one external display is in landscape mode above the ThinkPad, and the other is to the left in portrait mode. I highly recommend this configuration - the portrait mode display is great for reading docs and especially PDF files.)
• I run the external displays at 200% scaling and the internal at 300% to match the differing pixel density. I didn't see any way to support this configuration in Ubuntu, much less be able to move an app window between displays and have it automatically update its scaling factor to match the display. This works "out of the box" in Windows.
So I run Windows on the hardware and Ubuntu with my dev tools like PyCharm and SmartGit in a VMware VM. (VMware works a lot better for this than VirtualBox - the display response is much snappier.)
Of course these are my own needs, and I have no quarrel with anyone who has different preferences. But I welcome anything Microsoft can do to make this an even smoother experience than it already is.