I think, it is a trust issue, the lack of trust in the own workforce.

So, it easier to let the administration be done by a different company that can be held liable if something goes south. Mostly these are those consulting firms that make money with O365 integration (intune and the like). In the end, they earn only money with consulting and the risk is still with the client.

CEOs are connected with other CEOs and managers which already implemented the O365 BS and so they follow by example. They don't see that they gain nothing, only some grumpy devs that are forced to work with Windows. And you need an internal Windows admin anyway as a fulltime position which needs to be educated to use M$ tools which costs even more money gladly taken by the same consulting firms.

And what strikes me, this M$ Intune Gedöns can handle Ununtu Linux desktops, but devs are not allowed to use it on the desktop to increase productivity. The irony: The product they are developing is running on Linux servers.

I had to get this out of my system, sorry.