Depends on the region, no one where I work has an iPhone or a current Mac, so stuff gets tested on FF and Chrome, and Safari gets thoughts and prayers. We would test on Safari if it were simple, but alas.
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.
We are a very small company, and have always had far more Firefox than Safari users. And though they get by via dominance, IE style bundling of the browser to the OS is toxic, so good riddance.
