Currently, my XPS 15 with Xubuntu doesn't function after coming back from suspend and I haven't bothered to dig into why. I don't mind, but it's absolutely not a problem I experienced with windows on the same hardware or any mac I've ever owned.
But it's true that you better buy a laptop that you know has good support. eg: almost any dell, almost any asus, any thinkpad.
I mean, I still love it and these aren't life or death issues, it's just something fundamental about the nature of Linux in an ecosystem of proprietary hardware specs and commercial drivers. It will always be a fact of life. Just like Linux package management, because the software is open source, will always be better than on Windows or a Mac. That's a fact of life that can't really change because of the nature of _their_ ecosystems.
No harm in admitting the differences, but good for you if everything works out of the box!