I get what you’re trying to say but I work in a large healthcare organisation in the UK and our PCs run Windows. Most of the work across our organisation is done within a virtual machine window for our Electronic Patient Record; the local OS on the PC is largely irrelevant. The exception is that office is used for email and that causes a drag on moving away from Windows - people are used to using Outlook rather than just using a webmail or other tool.
Windows has that market share currently largely through inertia rather than going for the most cost effective option. The 15% in India with government and health sector use does count, it’s quite an achievement to have successfully deployed a vendor neutral operating system for other tools to be deployed on to. Shame it’s using Chrome though. In the UK Healthcare we’re wasting huge sums licensing and maintaining Windows when we really shouldn’t be.