Sure, emails are not the right tool for multiple people discussing a project, even less - when we want to add new members to a thread, or to leave (by those who were added, but for whom it is not longer relevant).

At the same time, when I was a cofounder & CTO, I used Basecamp, which promoted email-like threads. (There is a chat-like functionality as well, but I made policed to use it only for impromptu things like setting Zoom meetings or so, nor for anything that may be important in the future (brainstorming, ideas, architecture choices, analyzis, etc).

It created a culture of clarity of thoughts I never had before, or after. And yes, they a year later is was easy to search for why we picked this way of optimizing quantum computing in Rust not another (which pros and cons, possible paths not yet explored, etc), go back to unused UI designs, retrieve research for publication, etc.