There are vendors who sell laptops that come pre-installed with Linux. Only thing is that they’re a bit more niche. Dell is probably the biggest name who sells computers with Linux as an optional OS on their website, but IIRC they brand it as “developer editions”.
Otherwise, you get vendors like System76, Tuxedo, Purism, etc. (Maybe Framework, but IDR if they even install an OS)
I still don’t think that you can walk into a store and buy any of the above.
Not that installing Linux is difficult; in fact, it’s easier than installing Windows IMO. Most distros come with easy-to-use graphical installers with easy-to-understand language, even for newbies. They also come with a live environment that lets you try out the distro before installing it. Thing is, most people aren’t even going to bother trying it.