I don’t understand how a Microsoft team that respects its customers (and maintains shortcuts) can co-exist in an org that sees their customer as marks.
I had a negative view of MS when I was young. Then I got jobs at large orgs managing IT for 1000s of people. I don't know how else you'd do it without the Microsoft stack. I'm not saying you can't, but good luck managing whatever custom ball of knots you manage to come up with and also finding people to work on it for you. If you think open office and some kind of custom IAM solution will work, you just don't have the experience to have an opinion on it, IMHO.
My employer has thousands of employees across six countries, runs complex, multi-billion-dollar supply chains, and somehow manages just fine without the Microsoft stack.