You can say that about DOS too.
This is the only point I'll flat out disagree with you on. Even today, there's at least one commercial product I know of sold that make use of FreeDOS to boot into a clean PC environment for some of its operations. It's still a real thing for some people, although an admittedly small group.
No, that's wrong. The personal computer revolution had begun before DOS and in the 1980s was in full swing with or without DOS. There was a wide range of types such as Sinclairs, Commodores, Amigas, Amstrads alongside the IBM/DOS PC in the 1980-95 period. It was standardised on the IBM PC clone only gradually.
When you start getting into subjective territory like this, there will inevitably be disagreement about how you define the "beginning" of the personal computer revolution, I suppose. My guess is many geeks like us will tend to define it as "when I got my first computer". ;-)
I should probably have said *thoughout* the personal computer revolution, because you're correct that there were a lot of competitors in the early days. After all, my first computer was an Apple II, not a PC. Also, I think people are misunderstanding one of my statements. I said:
But it was really the PC, running MS-DOS for the most part, when the vast majority of people were introduced to computers for the first time.
Which I'd bet is probably accurate (although I admittedly have no numbers to back this up), as these were the machines they likely used at work. When it came time to purchase a machine of their own, it made sense to them to get another DOS or Windows-based PC, because that's what they knew. The DOS-PC's success at work made a bit impact on the home market, because as indicated, there were plenty of great competitors.
Well, anyhow, history is written by the winner. Or, rather, in this case, we look back and see the DOS-based PC as the most important of the line solely because of its place in history. We have to acknowledge that DOS is important not necessarily because of its qualities, but because of how widely used it became as the basis for Microsoft's reign over desktop computing, which continues even to this day.