you clearly are.... There are TONS of windows only software out there, and most INTERNAL systems that run companies, these internal LOB apps, often custom made for the companies, many many many of them (probally more than 50%) are windows server apps.
For example GE makes a Huge Industrial ecosystem of applications that runs a ton of factories, utilities, and other companies... Guess what all of that is windows based.
Many of the biggest ERP's run on MS SQL Server which until very recently was Windows Only, and most MS SQL Servers are still on windows server
To claim only 20% of all workloads are Windows shows an extreme bubble most likely in the realm of WEB BASED DEVELOPMENT, as highlighted by list of web technologies, php, node, etc..