Heck, we haven't figured it out in the real world, yet.
This article talks about Twitter's "block" facility, which they changed (and then, facing an uproar) changed back. It's as much about how the change process needs to work as much as the merits of what is being changed (or whether a change needs to be an addition).
What Online Communities Can Learn From Twitter’s ‘Block’ Blunder | Wired Opinion | Wired.com
After intense backlash from users Twitter reverted its block feature change, saying it ‘never want to introduce features at the cost of users feeling less safe.’ What just happened, and what can other companies learn from this? This may have been one recent incident, but it’s not an isolated one. And these kinds of features aren’t just abstract; they have a concrete impact on individual users and the health of online communities overall.