I personally can't speak to SV tech company. However I worked in msft and difference is staggering, it's two completely different universes.
>> ([..] most businesses these days) are driven by tech and would fall apart without it
Yup. It's like, is Coca-cola a "tech company with soda department"? Pretty sure they have programmers and some non-trivial IT infra as well.
Worked in several banks. "We are not bank, we are tech company with bank department" - was mentioned occasionally in each of them. What was also common - red tape, outdated software (tools, libraries, frameworks), restricted access to workstation, processes focused around pushing approvals around (instead of automation). That's why my response to "we are not a bank" sentiment above is "it's a bank, alright".
So much this.
Things I need my OS to do are: run my apps (office/browser/games), connect my devices (printers/game controllers/displays), basic file operations (copy/paste/delete)
And while doing this be: secure, reliable, out of my way.
All these adding people/chat/weather widgets "innovations" (looking at you, msft) make me throw my hand up in the air and ask "why", I wish they would spend that time and energy on security and reliability instead.