Completely disagree. Email is the one internet technology that's had the most success and provided the most benefit in the widest variety of use cases. It pre-dates the web by decades and is still the one technology used by almost every person who uses a computer at all. The very fact that it's not focused on a specific "process" and has very little in the way of required structure or content is a strength: it works almost everywhere.

The history of software is littered with dead, defunct, and failed attempts to create task managers and communication platforms that impose a process on users. It almost never works.