"4.1) How about a Mozilla Operating System?

"Mozilla is positioned well as an application software. However, it makes very little sense to try to make Mozilla into an operating [system], almost as little sense as it would to make a Word Processor or a MP3 player into one. Beyond technical reasons, the operating system market is currently glutted, and a new entry would be unlikely to attract enough users to ensure the writing of drivers for a new system, a critical mass point. People who want to work on an operating system no doubt would be welcomed by the BSD teams, the Linux team, the Freedows team, or any of the many other open source operating system groups out there."

That analysis appears to have applied to webOS just as clearly as it had applied to the desktop and laptop market a decade earlier.

And just to twist the knife a little more, the last sentence in the answer to 4.2 is "Reinvention of the wheel is a poor use of volunteers."

Because Chromebooks are such a failure right.

I might have seen around 5 total, on sale across European consumer stores, since they exist.

The fact that many people believed the dream -- including myself twenty years ago -- doesn't make the dream any more realistic. Eventually, people notice that they would like to do more things than their browser allows them to.

So, yes it is true that people have been willing to migrate to cheaper, limited computers (but mainly tablets and phones; not tiny laptops). But those computers are not generally modeled after using the browser for everything.