downvoted, because in your response you conflate two issues:
1. The problem with using Microsoft
2. The lack of institutional knowledge of securing BSD and MacOS and running either of those at the scale Microsoft systems are being run at.
The vast majority of corporate computer endpoints are running windows. The vast majority of corporate line-of-business systems are running Windows Server (or alternatively Microsoft 365).
That means a whole lot of people have knowledge on how to administer windows machines and servers. That means the cost of knowledge to adminster those systems is going down as more people know how to do it.
Contra that with MacOS Server administration, endpoint administration, or BSD Administration. Far fewer people know how to do that. Far fewer examples of documentation and fixing issues administrators have are on the internet, waiting to help the hapless system administrator who has a problem.
It's not just about better vs. worse from your perspective; it's about the cost of change and the cost of acquiring the knowledge necessary to run these corporate systems at scale -- not to mention the cost of converting any applications running on these Windows machines to run on BSD or MacOS -- both from an endpoint perspective and a corporate IT system perspective.
It's really not even feasible to suggest alternatives to any of the corporations using Microsoft that are impacted by this outage.
If you want to create an alternative to Microsoft's Corporate IT Administration you're gonna need to do a lot more than point to MacOS or BSD being "better".