The most egregious example that stood out to me here is the x-padding between the edge of the notification panel and any text inside the panel is less than the padding between the notification title and the text below it.

The problem isn't that they need more padding, it's that their padding makes no sense. If they made a design decision to have tight padding that would be one thing, but they've got a horizontal layout with tight padding in the horizontal direction and wide padding in the vertical.

here's a really quick-and-dirty edit to even out the padding around each text block to be equal to the line height, which actually tightens up the total density by correcting the too-high line height in the notification text: https://imgur.com/uVcY6Sw