User blog comment:MisterWoodhouse/Social Activity, the 2010 Editor, and Unpausing Migrations/@comment-5173123-20201009173335

Here are my complaints with UCP
 * No option to visually edit specific sections (headlines). yes, source editing exists but I would like to be able to see the changes of one headline at a time, this all or nothing approach returns HTTP 504 errors on several large (400kB) pages.
 * Visual editing window is far too cluttered.  Edit summary + the row with the Cancel and Save buttons + CC-BY-SA disclaimer + collapsible taskbar open by default make the edit window very cramped.
 * When you click on a table cell the page jumps down, often going beyond the cell requiring me to scroll back up.  It always happens when I first click a cell but I've noticed it occur when I edit two cells and go down a row.  This window jumping makes the editing process even more tedious.
 * Clicking on an infobox puts the edit button at the very top of the screen making it hard to click.
 * Infobox fields are now alphabetical instead of top to bottom.
 * There's no way to change text alignment from left to center.  The option is there but I've never been able to figure out how to activate it.
 * Adding onto the previous all or nothing issue, collapsible tables set to "collapsed" don't show up in the visual editor
 * Having to scroll all the way to the beginning of a page just to switch between source and visual editor is cumbersome and a major step backward from the previous editor.


 * Some cells are super bloated. The main table cells I use are too tall and instead of matching the height of a corresponding picture, they include far too much padding with an "Insert Paragraph" prompt above and below the text.
 * Finally, table colors are a weird grey instead of black, and redlinked pages are harder to see, that text color is significantly paler than the bright red I was used to pre-UCP

UCP definitely fixes some of my problems with the old editor (accidentally clicking on my wiki logo and losing hours of edits & link shortcuts) but it introduced a whole slew of unexpected and annoying problems.