I understand completely what you’re saying.
I feel like it’s really more of a preview for how listing “will look live” to a visitor, not me. As a lister/editor I just want to see a preview of how it looks live (meaning hopefully to people visiting not just me being the only one visiting it).
In other words, I think “how it will look live” as you stated is how the listing looks live/working in front of visitors. As a lister I would like to think hundreds of people, or more, are going to see the listing, not just me so how it looks to them is what is most important. The visitors are what make it live, not just me. It’s minor, sure, I think it would be a cleaner/more effective and intuitive preview without that button. But, I’m sure you guys have more important things to deal with. So, I hope you don’t mind my input on this. 🙂