Not idealistic at all. I see B2B products sell without dashboards all the time.
I’m not saying you can sell UX on its own. I agree with you there. But I don’t believe dashboards are strong selling points any longer. Even in B2B SaaS products. They’re too easy to copy and don’t tell a compelling story. And sales itself has changed dramatically. More companies are showing how content marketing can help sell products before a salesperson is involved. It’s not nearly as common for a sales call to be the first touchpoint for a prospect.
Dashboards are a part of the story but ultimately have become the most easily replicable feature of products and don’t encourage long term adoption. Prospects will often want to see them in some fashion, but they are quickly becoming less of the star in sales pitches.