[arendtio]

I am not sure if there really is a lack. I mean, I think I see what you mean, but given the fact that those are notifications, they are probably meant to feel 'thin' to not attract too much attention.

Another factor might be that those small, focussed screenshots are just not the appropriate format to show how those notifications would look like in the context of a complete desktop.

But in the end, it is also possible that there is an unintended lack of horizontal padding.