Slack has made chat hot. But here's why Google's Gmail product boss says chat is going to be swallowed up by email. (GOOG, GOOGL, WORK)

With Slack going public this week, Business Insider recently sat down with Jacob Bank, Gmail's director of product management, to learn more about Google's enterprise chat strategy. 
Bank said an important update will come later this summer when its team chat product, Hangouts Chat, moves into Gmail. 
"There's the classic user that likes to keep email and chat separately," Bank said. "But according to our research, the vast majority are just frustrated by having to constantly keep tabs