nobody on Nostr: So what goes to the push notification server in request. If someone is logged into ...

So what goes to the push notification server in request. If someone is logged into Amethyst with just 2 nsec at a time, why do we need to receive notifications for the other account we are currently not switched to? Couldn't the push server client call be changed to do 1 nsec at a time. Register itself again when you switch? (Or it is already one at a time, but you just grouped by some unique client metadata to get 10% )