Consensus is that the first ARM devices will be 13.3-inch MacBook Pro and a new redesigned 24" iMac, based mostly on Ming Chi Kuo's report from just before WWDC2020.
HP also was a leader in device ergonomics. Their devices were pretty and easy to use, as well as reliable.
I don't think anyone had offices. It was all cubicles. (I worked at HP Labs in the 80's and met both Bill and Dave a couple of times.)
One cool thing HP had was "lab stock" cabinets on every floor that were full of free-for-experimentation ICs and other components. I think it's likely that the Apple I and Apple II computers were designed using components taken from those lab stock cabinets. (The story is that Steve W. tried to get HP interested in producing the Apple computers, but they just wouldn't go for it.)
I'd be careful about giving too much credit to the original ARM design. In retrospect, like many early RISC designs, it was over-optimised for its original application. Most of the unique/novel features of the original ARM architecture turned out to be bad ideas in the long run. Most of them were later removed from the architecture, or persist only in backwards compatibility modes.
ARM is ubiquitous today more due to business models and historical accident than to inherent superiority of the design. (See also x86.)
The main reason Google launches popular products by invitation only is to manage server load. Otherwise you get situations like the Pokemon Go launch, where the service was unreliable for the first few months.
https://9to5mac.com/guides/ming-chi-kuo/