A bit of fluff in the article, but in general, yeah... nVidia Shield was an effort above the norm - which is why it served as a showcase for Nintendo Switch hardware. As some will know, the first Nintendo Switch uses the same Tegra X1 chip that the Shield has.
I dunno for sure, but seems to me that if the Shield didn't work the way it did, Nintendo likely wouldn't have chosen it's hardware to be at the core of Switch, if even though of the Switch as it is at all.
The console is majorly a thing that came to exist because Google and Apple failed to capitalize on gaming up to that point. They didn't understand the market, how to approach developers, how to make efficient use of the hardware, and many other things - so Nintendo took it.
A few things though... well, back in 2015 gaming was already huge, and Android set top boxes weren't exactly a new idea. The spectacularly failed Ouya came out back in 2013. xD
Original Chromecast also came out in 2013. nVidia Shield came out on a trail of mostly failed or niche experiments, on the Android side I mean. Good to note too, it also was among the first to introduce cloud gaming before the fad.
Of course, not only those, but it was at a time lots of companies were throwing out ideas like that to see if they stuck.
It's still ridiculous to this day to compare longevity and update cycles of mainstream brands to nVidia Shield, but if you had or have good hardware running on custom ROM, chances are it can still be up to date.
It does take extra work, but it's because of all the extra crap put on top of AOSP. If the OS/skin doesn't have too much shovelware on top of AOSP, minor changes in hardware evolution aside, there isn't a whole ton of impediments for an older hardware to run it.
This is also the reason why manufacturer OSs became more lightweight, less burdened with shovelware, and whatnot over the years.
So this is a thing that is more ridiculous that it's not the norm, rather than being unique to the Shield itself. It just shows that the limiting of update cycles is much more of an artificially imposed planned obsolescence style anti-consumer measure from mobile devices manufacturers rather than something we should have to live with.
Heck, my phone is from 2019, and it still works perfectly fine. And I'd root it and install a custom ROM to keep using it indefinitely, with proper security and system updates, if it wasn't for the fact that some important apps I need have surreptitiously started using Google Play Integrity which disables them if I root my phone. This is just how insidious the whole thing is.
Back in 2015... I was rockin' a Sony Xperia Z3. Not sure how useful it'd be today.... probably very sluggish. But still plenty useful as backup or alternate usage, if it wasn't for the imposed obsolescence. I broke the screen and replaced it a couple of times, plus battery changes, the 3rd time it just wasn't worth it anymore.
Anyways, back to the Shield... I almost bought it a few times. But it just didn't quite fit a need for me... I have always had my PC connected to the main living room TV since way back in early 2000s, so it doesn't make much sense to have a dedicated box for it as a separate device.
Then the Switch came out and it became a more apt replacement for the Shield, for my purposes I mean. I understand that for others it filled a need they had.
But yeah... for me, some aspects of the nVidia Shield displays what we all could already have, if we weren't so burdened with anti-consumer monopolistic bs. If AOSP had base level gamepad support and screen mirroring, just a few years after nVidia Shield everyone would have smartphones capable of working like it does.
And then you start thinking of all the things that we could've achieved if it wasn't for planned obsolescence, anti-consumer moves, and everything else that still dictates the market to this day.
I bet I could have a single Linux device running almost everything I need, with a docking station to expand hardware a bit for more specialized tasks. Then I'd just need a few monitors around the house switching back and forth when needed, perhaps with an extra machine for backup and home server stuff, which I'd be far less worried about (again, if it wasn't for monopolistic anti-consumer stuff).