I completely agree with your point, but I think it will depend heavily on how your team and company operates. For instance in my case we've adapted Slack for that instant-messaging urge and Basecamp for the "thread-like" vantage they pointed in Twist. The Slack + Basecamp synergy have proven to solve a lot of communication problems we had in projects.

But something that captured my attention to give Twist the benefit of doubt was that it may fit well between these two needs we have and also that they have: "Guest access for clients or contractors", which may create a more direct channel with clients than the hassle of email discussions on Basecamp.