The no. 1 reason ARM went ahead
What made them special is how they combined their hardware with their own version version of UNIX.
Hence why even trying to write portable code across UNIXEs wasn't as easy as many believe.
Irix had IrisGL, Iris Inventor, XFS and a few other goodies, before they became the Open variants.
SGI was also a big sponsor of the C++ STL work.
Domain Specific Architecture talk by Hennessy & Patterson, 2018 talk for 2017 Turing Award: http://iscaconf.org/isca2018/docs/HennessyPattersonTuringLec...
However I can say yes, we are returning to those days.
Thanks to the thin razor margins you see OEMs now selling un-upgradable phones, laptops, tablets, 2-1, leaving the old desktop PC for a niche market that gets smaller every year, mostly targeted at gamers.
Also OEMs got envious of Apple as the surviving icon of those days, all of them want to be Apple of their market and sell experiences.
Not business model per-se, but not being crippled by pointy hair boss types from C-levels to lowest level managers.
Second to that what got them ahead was their lack of greed and ambition.
Few people who had firsthand experience with buying IC IP licenses I know tell of MIPS 10 years ago as "we will not simply sell you a core, but force feed you all peripherals, and make you pay for 20 more licenses for god know what along the way." Compare it to ARM where you wire money today and get a guy coming to your office to drop off harddrives with netlists a week after.
For support, documentation, software, and everything else ARM was light years ahead.
I'm still impressed with my dual-R12000 Octane today.
Is this a specific reference? What device would that be?