I don’t know if you’re asking seriously, but if you are the answer is: Enterprise manageability and accountability. There’s a reason why every hospital, Fortune 500 corporate campus, military base, supermarket, distribution centre, etc, etc all run Windows workstations. Why would a ruthlessley profit-driven corporation buy expensive Windows licenses when Ubuntu is free? Because when you’re dealing with ten thousand workstation in 150 countries, each with own requirements for data protection, working time, employee rights, etc that not only need enforcing, but need to be audited, you can do all that with a single Windows server and a half-motivated sysadmin. And for everyone smaller than that, you still get access to those same tools for your school, office, factory, whatever on your fleet of twenty mismatched laptops from eight different vendors.

Nothing else comes close, and until it does nothing will change. They would all drop Windows in an instant if there was a sensible alternative.