I started my actual gig as CTO of construction group (Innovation Hub) a year ago. And it was a hell of a ride, implementing kind of a scrum-ban for project management, XP, peer-reviews, a git-flow, git commit message formats, linters, unit testing, integration tests, etc...
And it's the fun part because with the CIO we had to drive the board to do A LOT of changes in their IT/Innovation drive.

But in one year there is a lot of KPI that went up :
* Deployment: When I arrived it took three stressful days to deploy a new version of one application, once a month. Today we do it every week, and it takes three annoying hours.
* We had no test. NOTHING! Today we have 85% code coverage for the unit test, and automatic integration tests run by our CI server every day.
* We had almost no documentation. Today our code is our documentation (it automatically extracted and versioned).
* We had 0 add value in the use of git. With commit messages as "dev", "asked task", inside jokes and a lot of "fix" and "changes". Today we have a useful git, and we even use it to create our deploy changelogs (and it's only mildly annoying!).
* More important, the team is happy! They get their purpose, see betterment in their tech mastery. They started doing conception, applicative architecture, presentations, having fun.

There is still a LOT of bad things we are still working on, and trying to solve (support workflow and betterment). But seeing what they already did, I'm so proud of my TEAM! I'm a fucking asshole, workaholic, "just do it" kind of guy. But they managed to achieve so much. Fucking PROUD!!

Can someone explain to me why non-technical people even work in tech companies ??

I really don't want to sound like an asshole, but can you, for example, imagine that someone who doesn't even know what brick is would work on a construction site ?

Or can you imagine working in bike repair shop not knowing neither how to ride a bike nor how's bike is built ?

Sure, every company (especially large ones) needs bookkeepers/HRs/accountants etc. that don't need to know the inner workings of business.

Those people don't bother me, and they are necessary to keep the circus going.

I'm talking about all those middle management individuals.

All those "Project Managers" , "Business Analysts", "Directors' , "Principal Program Managers " etc etc ..

Such thing thing would be unthinkable in every other industry but somehow, in tech, anyone can work as long as they can throw a sufficient number of acronyms around.