Email is also universal. Using Twist or some other app means you have to onboard and train a customer onto a new platform to even start talking with them. There are some cases where you can replace email with Twist (formalized team communications), but there are way more uses for email.

The downside here is an email thread with 5+ people replying daily will quickly become unmanageable. If a single participant forgets to "Reply All" then the conversation can bifurcate again and again.

If I was managing a team of 5+ people I might use Twist. I would more likely onboard everyone onto existing project management software. Where the team can have threaded conversations, but also relate those convos to tasks, milestones, files, and other project info.