Many places support MacOS as well, so it would only be a third additional toolset. Plus, there’s a ton of overlap between toolchains, which reduces the overhead further. If you’re supporting enterprise MacOS, you’re probably using Foreman, JAMF, or Puppet with Active Directory.
Not to mention, a lot of places already have Linux servers, so the configuration management toolchains and expertise may already exist in a given organization, unless they’re absolutely pathologically mired in the Windows ecosystem. Which, granted, is a lot of places, but you’re making it sound far harder than it would be in a real world situation.