This is the correct answer. Even Ubuntu's famous bug #1 (Microsoft has a majority marketshare) was closed many years ago [1] as PC operating systems have declined in importance. Steve Jobs's comment about PCs being "trucks" has also come true. Almost all leisure computing has moved either to mobile devices (phones and tablets) and/or to the web (which overlaps mobile devices), making the OS less and less important. Gaming is about the only leisure activity left where desktop OS matters, but that's a relatively small marketshare comparatively.

[1] https://bugs.launchpad.net/ubuntu/+bug/1/comments/1834

And yet, Linux Desktop still is not dominant, even only counting desktop computers. Hmm...

As people use desktops less and less, they care less and less about what runs on them.

That narrative of the post-PC world collapsed when the sales of tablets like iPads collapsed.

Couple of things:

1) Tablets aren't the only "post-PC" platform. Most of the leisure computing is done on smartphones when it would have been done on a laptop or desktop 5-10 years ago.

2) If we're considering tablets to be PC replacements, we should expect their sales trends to be along the lines of PC sales. People keep PCs a lot longer than smartphones, so we should expect people to keep their iPads a lot longer than their phones too.

3) Tablet sales have absolutely not collapsed [1]

[1] https://www.statista.com/statistics/272595/global-shipments-...

From what I could tell, iPads are the only tablets still going strong and getting even better. It’s Google who threw in the towel on tablets.

See the recently revealed iPadOS: https://www.apple.com/ipados/ipados-preview/