I think y'all are reading too much into this.
Back in '09, 'Nix was not really that accessible or usable to the average person. If you were very familiar with Windows, like I was, 'Nix was kind of incomprehensible without a sharp learning curve. And unlike today, where Ubuntu and Mint are extremely widespread, there was the definite problem of the Linux community.
It was an 'old boys club' to the extreme. Newbie bashing on here is NOTHING compared to what it was in the late 20th and first years of the 21st century in the Linux community! Those people had an axe to grind, and just couldn't possibly get it sharp enough. I switched to Linux in '12, and haven't regretted it. But the community has changed.
The biggest roadblock to the general adoption of Linux in the early days (I'm talking 91 to about 2010) was the linux community itself. They openly viewed themselves as superior beings, and damn you if you wanted to break in! Then they whined about people using Windows when there was an oh-so-superior option. That it actually IS superior in a lot of ways was not a mitigating factor. Whether you love or hate Ubuntu, Canonical went a LONG WAY in changing that perception, and now 'Nix is gaining a lot of traction. It still has a lot sharper learning curve than Windows, but past that, I'd consider them about equal from the user perspective. But Windows is a LOT more friendly to a newbie, still, than any flavor of Nix.
Now as to Satoshi, first off, he/they were NOT outstanding coders. The later development team described the original code as "spaghetti code" in several instances. The brilliance of Bitcoin cannot really be understated, but it's brilliance is in concept, not the initial programming. If I were to field a guess, I'd leave out all the conspiracy theories (though I like some of them
) and just say it simple: He was familiar with Windows. Unix was still pretty esoteric back then.