I think there's a difference between an engineer working for someone, and the person making the product decision. If you're a developer for a software company b

I think there's a difference between an engineer working for someone, and the person making the product decision. If you're a developer for a software company building accounting software, and you don't have much use for accounting software personally, you're probably fine. But if you're defining the product, you're much better off if you've been a user of accounting software in the past.