This makes sense for improving the readability of lists with a lot of text, and I don’t think there are any issues with adding some additional margin between list items by default. Beyond adding:
we’d also need to make sure the composer preview is covered, and I’d likely want to add
ul li:last-child {
margin-bottom: 0;
}
So we’re not adding additional space to the bottom of the list.
I can probably do this at some point this week unless there are any objections.