I have no expertise in this field and this is what I got just from reading the article without doing any further research.

It seems that a consortium of giant tech companies got together to make a royalty-free video codec called AV1. This included getting legal agreements from a bunch of relevant patent holders that they wouldn’t pursue legal action against anyone implementing AV1.

However, due to the U.S. patent office’s current policy of issuing patents left and right and letting applicants sort out whether or not their patents are actually unique in court later, lawyers representing Dolby and a couple of other companies that hold some separate video-related patents have smelled money in the water and are trying to sort out whether or not their patents are unique in court.

A friendly heads-up: I think you mean “Liberation Serif”. Serif and sans-serif (“without serif”) are common categories for fonts.

Man pages are the only reference material I know that has more information-free circular definition chains than Wikipedia. And I imagine that it’s for much the same reason; they’re primarily written and fought over by experts who only need terse reminder notes for themselves, and who can’t remember what it was like not spending every day up to their elbows in the subject.

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I use Linux on hardware older and less capable than yours, and usually the only real show-stopper I find is a lack of Vulkan support. I don’t use any nVidia hardware, but my understanding is that older chips are supported decently by current Linux drivers. So I’d say you’ll probably be fine.

As for ten years from now, it’s uncommon for Linux software to remove features, and even if it happens, there’s virtually always a way for you stay on an old version if you really need to, because there are no forced updates. If you’re careful you can sometimes even keep the old versions of things for old software that needs it, while still having the latest version for software that can use it.

I have a stupid question: Are you sure you’re not confusing “line out” and “headphone out”? They’re different, and pretty much every desktop supports both these days. But standard PC speakers usually connect to the “headphone” socket.