It reminds me an article from the author of Paul Buchheit (gmail's creator), when he was beta testing it internally with Google employees.
Many of them were asking for email preview popups directly from the inbox. Instead of implementing it, he realized the need wasn't for a popup but for a wait to see your email quickly. The real issue was that it was slow when you clicked on an email, so he made it fast instead.
Many of them were asking for email preview popups directly from the inbox. Instead of implementing it, he realized the need wasn't for a popup but for a wait to see your email quickly. The real issue was that it was slow when you clicked on an email, so he made it fast instead.