If you are a consumer facing site, every single customer of yours will have a point where they know nothing about you and need to decide whether to go with you or a competitor. That's the kind of thing that A/B testing is good for.

However if you've got an "enterprise product" that people have to use because their management tells them that they have to, then this does not apply to you.

So what you say can be true. But is probably true for fewer companies than think it is true about them.