That's not necessarily true. Especially for beginners - they often end up in driver (un)availability hell for some component or another.
Not lately. I tried three laptops somewhat randomly. Everything worked out of the box.
Even if there are drivers, a lot of them are really buggy.
I'd expect official Linux support to guarantee better quality level (less buggy)
I don't begrudge anyone buying a laptop with Linux pre-installed, but at least in my experience, most mainstream laptops work pretty well out of the box with Linux nowadays. In the past decade, I've used a a custom Sager notebook, a Lenovo Ideapad, and most recently, an HP Elitebook, and on all three, wifi and graphics worked without needing to do any driver configuration. On the Elitebook (which I'm typing this comment from), the touch screen even worked out of the box on Linux, which surprised me, as I wasn't planning on getting it working myself if it didn't.
I had a similar experience with Dell XPS 13 and Arch. Everything worked out of the box including touch screen and external dock (monitors, USB). Actually I had the feeling it worked even better than on Windows (where the dock needed some fiddling with USB 3 drivers).
I got the dell precision 5520 with ubuntu preinstalled and I promptly installed arch. My experience (aside from nvidia) was pretty much as good as it gets with linux. I never had any issues with wifi etc. If one is spending 1k+ on a laptop I would recomend buying it with linux because 1. you know that all of the chips are compatible with linux and 2. it is usually $100 cheaper