Currently all notifications in the WP Admin are placed in between the title and content of pages. This is bad, because it is taking up space pushing the expected content down.
This type of behaviour should be reserved for content or elements that require you to do something, not for someone or something telling you that you did an awesome job saving that page.
It breaks the user flow and even though not many users see "small" user experience flaws like this as an actual problem, it does pile up until the point where users notice them and get annoyed by them. For me that point has come a long time ago, but I'm hearing people around me experiencing the same. "Why does this happen, it's stupid...", and I agree.
This made me submit this idea.
Notifications should be non-disruptive. Maybe slide in or pop on screen to get a little attention but it should float and not take up any active space. Floating it in an empty space in the admin bar would be ideal. For the sake of a quick explanation I've attached an example floating it somewhere else, but you can see it does not take up more space than it should.
Or success messages anyway... With messages that require the user to do something, that is different.
User case: When a user is working on a page and clicks the [update] button, the page reloads. This takes a second, depending on the speed of the internet connection and browser (and hardware), even on very fast computers and internet connections. During this loading of the page, many users already move their mouse to the position of their next action, whatever that may be. Whether it being clicking in the textarea, title bar, the [view page] button or doing a metabox action.
In any case, you need to re-adjust your mouse position after it has fully reloaded because of the system notification pushing the content down.
TL;DR
Float notifications in the WP Admin, make them non-disruptive.
Attachment: Visual explanation of problem/solution ยป