I really like the principle of making activity summary opt-in, but I now think most people simply are too likely to miss that option. It may take a few engagements before most people start looking over the forum more and even learning about opt-in possibilities. If they don’t post and don’t then get activity summaries, we may lose people before that happens.
I want only people who actually want the summaries to get them. But it seems too much of a sacrifice for us if we have most people who want the summaries not getting them just to more respect those who don’t want them.
I propose we switch it back to default-on for now. We can plan to later investigate ways to more proactively prompt new users to consider this setting. If we can put something a little more in their face to get them to choose one or the other, we could move it back to opt-in.