Shitty companies did it like that back then - and shitty companies still don’t properly utilize what easy tools they have available for controlled deployment nowayads. So nothing really changed, just that the amount of people (and with that, amount of morons) skyrocketed.
I had automated builds out of CVS with deployment to staging, and option to deploy to production after tests over 15 years ago.
Did pretty much the same with a new server recently - spent ages debugging why it didn’t find the SAS disks. Turns out, disks like to have power connected, and no amount of debugging on software level will help you.