I bought one (an Oryx) to replace a macbook because it comes all set up and ready to go (no driver problems, no tinkering needed). I know it would have been cheaper to buy a machine and install linux on it but its a lot of extra work. I'd honestly just rather pay them to deal with it.
I'm using there OS (pop!) which is Ubuntu based, and works fine (although I'm not sure why they have there own OS, it gave me pause frankly, they have Ubuntu as well). It works well and seems to have updates quite frequently.
I really like the machine, its had no problems and has been easy to setup and use. There are some minor things I don't love, the battery life isn't great and I have to reboot to switch video cards (the laptop has 2 and only one supports external screens).
But jetbrains software works and the web works fine, so I'm pretty happy.
I think this makes sense. Their core bussiness is producing an integrated Linux hardware/software package. When a compatability issue comes up, they probably don't want to have to wait on a third party to resolve it; especially when they can still leverage most of the work that said third party does (and; I presume, contribute back their work).
It's a matter of branding. Which is great too as long as they keep up to date with security updates and such.
The only issue I have with Pop is the name... and I guess that's something I can get over given how well it works. :)
The fans run a lot, (especially when using the Nvidia graphics). I tend to push the machine a little though.
I used a Pangolin for my personal machine from 2013-2015. Replaced it with a MBP because I wanted to do some iOS/watchOS development, but it still works, and I still go back to it when I need a Linux laptop in a pinch. They're good, solid machines, and I could unbox it and boot up Linux without worrying whether some driver would be incompatible with the hardware.
Since then, the wlan drivers got replaced, disk encryption had to be manually fixed and video hardware acceleration was gone and required patching the distribution.
So much for Macintosh of Linux.
I know where I will be getting my first sls 3d printer from.
Compare to IBM. IBM created the somewhat open "PC" platform in the 80s. Within ten years there were dozens, maybe hundreds, of companies making "PC Compatible" computers. IBM stopped making PCs. Their platform "won" the marketplace but they, as a company, left the marketplace. IBM is still in business because their primary business was not making or selling personal computers.
Another comparison might be Google. Its a stretch because android is not a hardware platform as such, more of software. However Android phone is relatively open. As a platform Android has 'won' the marketplace. But Google's primary business is not selling phones or phone OSes. They make a handful of phones, and might stop at any time.
There was the 3d printer company. Makerbot. They were theoretically supposed to be open. However they, well some of them in the company, wound up deciding it was not possible because of clones. So they went closed. They also sold out to a huge conglomerate whose primary business is not personal 3d printers. I am not sure if you could say their 'platform' has 'won'....
So if I am right, then if System76 creates an 'open platform' then there will be Compatibles springing up all over. System76 'platform' might win the marketplace. But what will happen to them as a company? What is their primary business.
People mention Prusa. Maybe that might work.
There would be no open PC clones if IBM had succeed suing the clone makers or if PS/2 MCA architecture had actually worked out.
We would all be using variants of Atari, Amiga, Mac, Archimedes by now instead.
Which ironically is what laptops, 2-1 and mobile platforms have become.
The open platform already exists, they are merely a player in it. Perhaps they've brought some new hardware, but unless it is x86/64 legacy compatible there is little chance it will succeed.
Trust it's going to work, trust they'll support it and trust that it won't come with spyware built in.