The typical person making a purchase decision doesn't know what the app does in any detail. So if he sees less information on screen he thinks it's easier to us

The typical person making a purchase decision doesn't know what the app does in any detail. So if he sees less information on screen he thinks it's easier to use, as compared to more information on screen. Of course the opposite is normally true, which is where the trouble starts. It also looks similar to simple consumer apps that the decision-maker is used to. Finally the UX designer says magic words like "clean" and "simple" and "focused" and "beautiful" and the sale is made. The lesson here is to find way to counteract this. User engagement metrics would be the last line of defense. Earlier than that maybe small focus groups. But something is already lost by the time we got here - we're not on the same page wrt what is important and what are the criteria. I'm open to suggestions here.