1: I just don't see who these articles are written for. Linux is on the desktop, it's called Steam Deck, and millions are are using it. So, the author is wrong here in the spirit of the question, and the truth of the question.
2: The statement "Linux developers spend very little to no time checking that their code changes don't cause regressions or breakages" cannot be applied to all or possibly most developers. What packages is TFA talking about here? Maybe TFA means "Denuvo developers spend very little time checking that their code changes don't cause rootkits or kernel exploits - in Windows."
3: "Lack of general software" - TFA seems to be arguing that because software is not specifically compiled for Linux, it is therefore not "available", which is laughably false. My entire Steam library works just fine on the Steam Deck and in Debian. In fact, many of those games run on Steam/Proton when they could not be made to run on modern versions of Windows.
4: "Poor file and folder sharing" - I don't think TFA has ever tried Samba in an all-Linux environment, but I will grant that permissions across machines can be tricky. You know, like sharing folders between Windows XP, 7, 10, and 11.
5: "Lack of funding on the desktop" - Listen, I don't think IBM/RedHat are underfunded. I don't prefer Gnome Desktop, but it's perfectly functional, and funding doesn't seem to be an issue there. Maybe we should ask Canonical if they've ever funded desktop work.
6: "Hardware support and compatibility" - Listen, I'm using an HP 1012 laser printer. Microsoft stopped writing drivers for this perfectly usable printer in Windows 8. I'm using a modern GPU (Radeon 6700XT) that has drivers built right into the kernel. I'm using a scanner that was new when Windows 2000 was new, and I can tell you, it won't work in Windows anymore but it will for sure work in Linux. Once again, TFA does not give examples.
7: Ok, I'll give him this one. You can pay for commercial support for Linux if you want it, though! Canonical and Redhat would love to have your money.
Summing up, it seems like this guy is just complaining that Linux isn't a commercially-supported O/S, except it is, if you pay for it. Maybe he means "Linux isn't Windows." So, his entire premise is wrong, and trolly. And speaking of trolls, you'll see TFA's name in the ars forum if you search, and I'll give you two guesses what his posts there look like.