The problem with the current system is that you get almost no testing while the flag defaults to off, and then when it defaults to on evetybody starts depending on it.<p>With a time-delimited system rather than a flag-delimited system, people con try things out without having to learn about flags. More importantly, they can set things up on a staging server or in a beta environment, then distribute the link to potentially non-technical stakeholders and testers without having to include detailed instructions on setting flags.<p>The hope is that this will lead to better feedback about medium and large scale deployment of new features, instead of only lone-web-developer feedback.