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Many companies have ISO, PCI, etc conditions that require them to maintain positive control over devices on their networks. This will include both security tools, like endpoint agents, but also policy controls like Active Directory and Intune (MDM). There are also a few oddball vpn services that only work under Windows (no clue why people buy them). Getting all that working under one operating system is difficult enough. Each additional OS generally requires a redo of those efforts, plus effort to maintain interoperability.

That said, there are efforts to get tools like Intune to work on Linux, but it's still early days.

Said as someone who vastly prefers working under Linux.