Currently, when users register for the channel and select to receive "All" notification, they will receive information about all activities from the channel: new videos, livestreams, community posts...
However, Google says this can easily overload users.
The new testing feature will not send push-ups from less interactive user channels, but still allow you to view all notifications in the notification box.
Although it is well-intentioned, this experiment makes many content creators worried. Losing notification to audiences, even passive viewers, can affect views, visibility and revenue.
Many YouTubers have repeatedly emphasized the role of notifications in connecting with viewers.
Some users also reported that they did not receive notification even though it was fully enabled. Instead of improving stability, selecting notifications according to the interaction level can make the user experience more complicated.
YouTube is trying to balance between viewer satisfaction and creator rights. Whether this solution is effective or causes more trouble, the answer will be clear after the trial is over.