It's a bit like how people who browse without an adblocker aren't even consciously aware of them anymore, but you use their computer for a second and want to rip your eyes out.
Or they forget how much time they spent tweaking their system to get it just right. My Linux systems are now good as gold. I can say I have no issues whatsoever. They work reliably for me day after day. But hell if I didn't spend hours/days setting up all sorts of crazy things you'd expect to just work out of the box like Sleep/Suspend, WiFi, and High-DPI displays.
Frankly, I was a little shocked it worked as well as it did. Hell, even my USB dock was plug-and-play, which really blew me away. I was used to Linux on laptops being a giant PITA, and yet...