How do you sell what you did as “it just worked”? Rightaway? You lied to them. You have your coworkers on an unmanaged machine with a foreign OS on the guest WiFi with custom networking. Don’t oversell a workaround as a solution.
Simplifying the problem to “Windows” seems unfair, given how many problems you found. All of them still require a long-term solution for regular operation.
Maybe I’m just old, but I thought a distribution is literally just a package delivery basically, just like you speculated. Making software work together nicely is actually already hard enough IMO. I don’t think anything is wrong. Valid question though