A while ago I decided to start a UI pass on Longform, smoothing over all the rough edges, bringing everything closer to Obsidian's overall design language, and leveraging Obsidian's native CSS styling and classes wherever possible.
The result is much more cohesive with the rest of Obsidian, easier to parse at a glance, and more intuitive overall (like more obvious visual differentiation between text, select menus, and tabs).

Lots of work still to be done on the Compile tab, but wanted to share progress in case anything like this might already be underway by someone else.