Microsoft Surface and Google Pixel are both similar examples, but they don't really feel substantially better than alternatives where the hardware and software stacks are less unified. The primary difference between Steam Deck and other Linux experiences isn't really that the hardware and software are unified, it's that you're actually running a supported configuration in the first place. Almost all Linux setups are ultimately ran on hardware that was built to run Windows in the first place. Even System76 laptops ultimately (today) come from hardware designed for Windows laptops. Steam Deck is flat out, start to finish, all the way down to the APU, designed to boot into Linux, and it shows. On the contrary, booting Windows on it gives you some of the hallmarks of a typical Linux experience on less supported hardware.

But I don't think that's really what the comment was about. I think what is really interesting here is the community.

I think the close collaboration between Valve and the Linux community is pretty unique. Mac has always had a very vocal fanbase, but Apple is a notoriously secretive and stubborn company. Valve is doing all of this work in the open including customer support, which is fostering quite a community. I think to compare it to Mac computers misses the point; Mac has an unusually large base of enthusiasts, much larger than the Steam Deck userbase, but it's not strength in numbers that is intriguing here.