Please note that the Hide Nag Messages feature doesn’t seem to work.
I’ve activated it, created a new admin user, logged in with it and I can still see the messages.
As you can see, the messages still appear everywhere.
Sorry for the late reply. The problem we have is that there are many different way for plugins to add their own messages. If they follow the standard WordPress way of doing it (update_nag and maintenace_nag), we can hide it. However, as your example shows, this is not always the case. We are looking for a way to catch all these variations without having to solve it on a per plugin basis.
@videousermanuals thanks for the reply.
If you need some hints on a better implementation, you can check this plugin which catches most of the plugin messages and hides them in a dashboard tab.