Why does it have to be pre-loaded with Linux? Any flavor of Linux is easy to install yourself. Who cares if the lappy comes with Windows or not.
Because Linux Torvalds himself has said that the ONLY reason that Linux has not had widespread desktop adoption is that it's not preloaded onto computers like Windows or OS X (not because it just plain SUCKS as a desktop OS and has no commercial software where it counts).
I've seen ENDLESS Linux parades on news sites about Windows (yes, Windows 10 is spyware and sucks so come use Linux Mint which is the most awesome thing ever made, blah blah blah). The problem is that it's only easy to use if the software you want to use is available on their "repository" and that repository is kept up to date. I remember like 5 new versions of Firefox coming out for Windows/OS X before a single update appeared on a repository before (because the distributions disable the auto-updates an official build has, but you had to install Firefox yourself directly to get the one that didn't and it would often put it in a "weird" place on your computer because distributions often put applications in different places "Just because" when it comes to Linux. Updates for things like Firefox are often for SECURITY reasons and the repository maintainers are typically working for free so it just doesn't get done in a hurry. Great, eh? You want the latest and greatest immediately on Linux? I had to build from source before to get it. That's fun for noobs worldwide! Fun for the whole family!
And what happens when you get to a MAJOR software update for a given distribution? Is it like OS X where you just click update and "it just works" (well most of the time)? NO NO NO NO NO NO!!! MOST distributions have NO OPTION to do major updates PERIOD and in my experience the ones that do are often unstable afterwards so like with Windows of old, your best option for a major update was to reinstall from scratch or what is called a "clean install" (which in the Linux world can be like every 6 months, especially in the old days where an actual feature you almost NEEDED came out like say USB support for something (that had support for 6 years prior in Windows and 8 years prior in OS X) would only appear in the newest most unstable distributions since it just came out and yet without it your computer was not able to use a web cam or a scanner or whatever and so if you were going to build a Linux machine you could only pick from these 5 parts out of 200,000 parts or it just wouldn't work at all since there were no drivers and the drivers for those 5 were funky because they were reverse-engineered for 3 of them and 2-bit hack jobs on the other two.
The point is that to do a "major" update you have wipe/reinstall Linux to do it with most distributions. This is why they recommend separating your "home" directory on a separate partition from the rest of the distribution so your personal files don't get wiped every update. The problem is that only means media, documents, etc. All you "applications" have to be reinstalled from scratch every major update (unheard of in Windows or OS X for just an "update" although a clean install "update" of Windows requires the same thing) and a MAJOR PAIN THE BUTT (hope you like spending your time maintaining your OS rather than just using it!) And that is the gist of it! Linux is either for extreme computer noobs who NEVER update or have their nerdy son do it for them but used to get tons of viruses online with Windows (e.g. old people that don't know anything about computers) or it's for extreme nerds who have more fun playing with the OS itself than any actual usable software (let alone have a life outside their computer). It's NOT for people in-between that want to stay reasonably up-to-date but don't want a HASSLE every 8 months (e.g. I went two years without updating OS X because Yosemite was reported to suck, but when I did update to El Capitain, I easily backed everything up on a bootable external drive with Carbon Copy Cloner first and then updated automatically and everything went fine and I had ONE program not work and it was an expensive one, but 10.11.1 fixed it. I could have easily switched back if I needed to with CCC and I didn't have to install or re-install ONE SINGLE FRACKING PROGRAM since Leopard across two machines (i.e. This Mac Mini imported most of my configuration and programs from my PPC Power Mac (that by that time had mostly Universal binaries and so it worked just fine moving from one CPU system to another) and that's a whole different fracking architecture! No Linux machine on earth could do such a thing and work without recompiling or installing new software from some repository! Linux is user friendly? Bullcrap.
Yet entire droves of Linux people deride OS X as for simpletons or something? Simpletons? I CAN do those other things and I know the Unix/Linux command line. I don't WANT to spend my time doing those things anymore. I'm out of my OS "fan" stage and just want to get things done and relax and play a game (yeah, lots of games in the past for Linux although that's slowly changing solely due to Valve).
The ENTIRE LINUX KERNEL is a "hack job". Just look at its source code some time and compare that to Open Solaris' source code. One of the people that worked on the Linux kernel has been quoted as saying basically that Open Solaris was like a fracking (well he said the other word) Star Destroyer compared to Linux which was more like the Falcon (fast but held together with duct tape and could explode any minute). These are public quotes stored on Wikipedia for posterity even. Go read them if you don't believe me.
Linux has its place and uses, though. For example, I just installed OpenELEC on a USB stick after taking apart a 1st Gen Apple TV and removing its (fried) WiFi card and installing a Broadcom HD Video decoder card. An ATV from 2007 can now play 1080p HD video and have 60-80% of its mere single core 1GHz CPU free while doing so and with only 256MB of ram! But we're talking about updates that update the entire OS and Kodi at the same time and that's the only things that run on it! Your only job is to backup your config/database files for Kodi before you upgrade. In other words, a major update where you only run one program is no big deal. But I do not find it pleasant as a desktop OS and I've tried it over a dozen times since 1998 (last time in 2013 not counting the latest OpenElec which just came out two months ago and is now on my 1st Gen ATV running 15.2 Isengard Kodi).