[haswell]

> …means the vast majority of users don't even have the chance to try the feature out to figure out if it's useful for them. Hence the default on.

This seems reasonable for new customers, maybe? but for existing customers this is pretty heavy handed.

I get that you want users to experience the benefits of this feature, but I personally would prefer to be informed of the feature and its value, and guided to opt in. I’d prefer to make that choice. Especially considering the potential downsides of accidentally preserving all of one’s search history.