If someone else is paying I'd prefer one of these big OEMs for established firmware lifecycle, spare parts and long gray market availability, shock (shipping) and thermodynamics engineering. If I'm paying, Asus or MiTAC (Tyan) are good enough.

this is apple today.

Sure they had an in house chip development ARM team right at the time when RISC economics looked good but CPU architecture had to work harder and harder to beat the memory wall and SPARC was not competitive by 2005 and “Hail Mary” projects like CoolThreads were difficult and expensive but did not deliver for customers.

Hypothetically customers could benefit from that proprietary stuff but they benefit even more from rapid progress is competitive, commodity markets.

When I was working at the library circa 2005 we were thinking about replacing all the Windows computers that patrons used to access the online catalog (and other services) with a web browser with Sun Rays, we probably would have bought a few hundred of them and we would have bought some SPARC servers to back them up.

We could have gotten Netscape to run under Solaris but after a week of effort I wasn't able to get Mozilla to build, so no modern web browser. So no Sun Rays. No servers. DTrace and ZFS were great innovations but without the magic of "can run the software you need to run" they are just Blub. Had Sun done the work to get Mozilla running on their machines and forgotten about DTrace and ZFS people might still be using Solaris... but instead DTrace and ZFS found an audience by supporting... the commodity OS!

(arguably at that time supporting a web browser was the #1, #2 and all the way through #99 task that the Solaris team should have been working on at that time and everything else from Java to Tcl to ZFS was a dangerous distraction... and that's how companies in a position like Sun die)