[vishnugupta]

> Email is the best method of communication for anything complex.

In my experience email is best when audience is less than 5 and have a tightly shared context. I've seen innocuous looking proposals getting out of hand just 'coz people jumped in to respond; multiple threads forming and so on. It gets nightmarish very fast.

I've found a combination of shared docs + meeting to arrive at consensus to work well. A small group of people propose a design/solution in a doc. Share it with wider stake holders get their first round of feedback, incorporate it in the doc and then have one or two in-person meeting(s) to get them all sign-off. Slack could be used to have short conversations but not ideal from what I've experienced.

This is with respect to a a for-profit organisation. Can't speak about open source as I don't have any experience collaborating there.