It seems like there may be somewhat of a circular dependency problem with certain kinds of unstable features - they aren’t compelling enough for people to jump off the stable train to use them, but we don’t want to stabilize them until people have had a chance to try them out and make sure they actually fulfill their purpose properly. One way to get more eyes on a feature when we’re considering stabilizing it is to have a “final comment period” for the feature, like this one for the Debug builders: Final comment period for Debug Builders stabilization. At the very least, it’s a “speak now or forever hold your peace” message to get people to read over the API and be aware of its existence. We’ll have to be careful to keep them from turning into huge bikesheds though.