Not really sure why @TeamYouTube feels the need to shaft creators at every turn.
If someone subscribes to a channel, they should see the videos from those channels. Period.
It should not be about what Youtube wants you to see, it should be about what the user wants to see.
When I subscribe, I want to see every notification. I've opted in to your content. Ring the bell by default. Let me "opt out" with the bell if I want to see fewer notices from that channel.