For most businesses, the cost and difficulty of shifting away from Microsoft outweigh the benefits
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Some things go deep, true. However most businesses don't use most of Microsoft products - even the ones that do, the usage of the more complicated products is far more minuscule than imagined by e.g. CFOs, etc.
The real thing keeping many "in the fold" as it were would be authentication services.
Which are overcomplicated and probably easier to manage without...
Microsoft Active Directory has excellent tooling for middle-management-heavy businesses. For better or for worse it provides the most integrated solution to reduce a desktop PC to a perfect thing for repetitive, boring, soul crushing office work. No other software solution comes close.
While I like Windows as a desktop platform, the reasons that it was designed as it is are very clear. To make cheapest laptops as dystopian as possible, you need systems that can run the same boring software for decades. Not for the good for the environment but for profits.
Windows provides all APIs to deeply integrate with Active Directory and MS Office. All engineering, accounting and finance software are deeply integrated with them. They literally run entire countries. I have seen engineering software that used Visio diagrams for designing factory pipelines. It is near impossible to pull the bigger businesses and governments out of this trap without completely upending entire sectors worth trillions. I think only very determined regimes like China can pull it off.
Like if orgs need this capability why is there no good open source solution?
Samba, krb5 &co can handle small cases, but it's architecture is still stuck in the nt4 days, and there's limited cohesive integration with LDAP and the other services.