This is a casual-ish screen recording of the in-progress UI state of oolong, my #ActivityPub / #Mastodon server+client.
I started with the traditional four columns but recently switched to a more dynamic style where the utility/controls column and the timeline column are the only constants. As you can see I haven't worked out the right way to make the column widths balance, and haven't spent any time trying to e.g. adjust font sizes when columns are small, etc.
But already, with the paradigm shift of new-stuff-at-the-bottom I like it a lot better than new-stuff-at-the-top interfaces because the natural reading order of text for me is top-to-bottom.