The fact that Linux is still around 4% of the desktop market share is the example I use to illustrate that technical superiority doesn't always means commercial success.
My wife is not a technical person. She wouldn't know what Linux was or even that it existed if I never told her. Much less how to install it, what benefits it has in relation to Windows, etc.
For her, if her computer is slow, it is because it is old or broken, not because the OS is a pile of crap.
Beyond that, switching OS can be a major endeavor. I wanted to switch to Linux years before I took the plunge 3 years ago, but many things (including inertia) held me back.
It was when I was going to do one of my yearly fresh windows installs that I decided to "let me give Linux a shot, if it doesn't work I do the fresh Windows install later". Linux worked well, and now I am here.
The games segment is being slowly chipped away by things like the Steam console, with the Wine / Proton layer also runnable under normal desktop Linux.
The rest is very likely stuck "forever". Maybe the CAD software, and other third-party software, will run adequately under Wine one day; MSO likely never will, at least not legally.
I get it's hard to see that now given that web app versions of things like Office are terrible.
"Desktops" are a weird thing corporate types have to use to get paid, when they aren't glued to TikTok or Insta or whatever on their phones.
For some strange reason, when people speak about Linux adoption, they mean GNU/Linux but never say it. Then comments like yours appear. Android has almost nothing to do with actual Linux. You can't run Linux-specific software or drivers. Case in point: Librem 5 runs GNU/Linux, and it's not very popular.
Except the whole driver, storage, security and network stack, which people spend whole careers working on. Look if the kernel doesn't interest you, that's fine. But it's (by far) the biggest component of the system and to some of us it's kinda notable that it's taken over the world. You can semantically define us out of existence but it doesn't make the software go away. You're just not paying attention to it.
Now, sure, you can define that as unimportant. But you can't define it as unsuccessful, which was the criterion I responded to upthread.
Either way, Linux the kernel has won everywhere but the desktop: server space, handheld, embedded, etc.
In my house there is not a single device without a Linux kernel. This includes my NAS, the fridge, both washing machines, all routers, our tv, a gaming console, all mobile devices, my kids PC, my wife's laptop, and mine as well.
It wasn't even a religious choice or something. Out of 20+ devices only 5 required some kind of choice: buying 2 Samsung phones instead of whatever apple sells, 2 dell laptops with Linux preinstalled and a steam deck.
Linux success is so massive, I couldn't even imagine it 25 years ago.
Because when you say "still", then put it into the perspective of:
On statcounter, it was 3% mid-last year.
On steam, it's currently over 2% and was 1% in 2021.
So you can stay it's still 4%, or you can say it's grown 50%+ in recent years.
Assuming the performance is above some minimum threshold, of course.