Maybe for your app, it doesn’t make sense. And if it’s a pure enterprise app, fair enough (assuming it’s an enterprise that was started more than 15 years ago and only targets regulated or very specific markets). But a good way to guarantee that your app will never go beyond Windows desktop users is to ignore the most dominant mobile platform by users who actually pay for software.
My logs tell me what they try to use. It’s not safari. Also they are paying users and would tell me if it didn’t work on their browser. The demographic I target is 99%+ Windows users.