As you probably know connectors and apps are tighened together by connections. And when you change the connector and want to use the new added services, you need to update the connection. That means you also have to remove the connection from the app and re-add it again to get the new functionalities.
Problem arises when you have one connection for one REST data source shared between apps. Change in connection then affects all the apps that are using the connector, even apps you do not want to use the new functionalities in.
So essentially you have to go to every app, and re-create connections in every step PLUS the same in Flow.
Solution is to have connection for every app. Now the challenge arises - It is possible to see connected apps from the connection. Well so far so good. But when creating a new app and adding connection you cannot see which connection is for which app.
It would be handy to have some friendly names for connections and not the one generated from name only.