“Below 10 events per day per campaign things are going to go a little bit wrong. If you're too early you can't do qualified trials because you already only have five trials per day — don't try to filter them.”

Volume vs. quality: you need ~10 events/day per campaign before filtering

Signal engineering's quality improvements are useless if volume is too thin for the platform to learn. Thomas Petit's rule of thumb: below roughly 10 events per day per campaign, focus on increasing volume rather than filtering. At that stage, it's better to send a broader event (including pre-trial intent signals) to give the platform enough data to work with, then layer in qualification once scale is reached.