Both just work, with the only configuration I had to do was to swap them round (left/right) is display settings.
Maybe windows has caught up with this now, last time I used windows I had to install "drivers", which seemed to be advertising programs which took up most of my CPU, to use basic peripherals.
This comment kind of decreases the your argument. If you are using Linux you know what a device driver is. This naïve take on drivers just doesn't fly. I couldn't ware less about windows, but the last time I used it (I think Windows 7) I didn't have to install any additional driver.
And on Linux you also have to install "drivers" either closed source (nvidia) or open source (nouveau) to make use of 3d acceleration. So, if you don't know what these "drivers" are, I suggest you read on them and how to install them in your preferred Linux distro, as it can strongly improve your Linux experience if you happen to have a discrete graphics chip in your computer.
It is running two GPUs, one of them Nvidia. That's an entirely different league, than plugging a second monitor into a Linux system.
Linux mint 20 is my main OS in my self-built PC ( and works for me pretty well (for development, browsing and gaming via Proton). But I wouldn't try to convince ANY non-technical user to get into Linux. Because installing it is half the battle, once they start doing "their stuff" (plug a second monitor, plug some device, open some file, etc) there's good chance that it won't work.
[1] https://askubuntu.com/questions/593938/how-to-run-both-intel...