User blog comment:MisterWoodhouse/Social Activity, the 2010 Editor, and Unpausing Migrations/@comment-45502197-20201016183611

Problems I've found about the UCP:
 * On mobile, the desktop source editor is a headache due to text that I type appearing two lines below the line I've selected
 * The mobile editor doesn't seem to have a source mode, making editing infoboxes impossible