User blog comment:MisterWoodhouse/Social Activity, the 2010 Editor, and Unpausing Migrations/@comment-45502197-20201016183611/@comment-1038387-20201018135402

I rarely edit Legacy on mobile, because of source mode. You have to switch keyboards twice or thrice to get to the proper [. It's not something to hold against UCP, it was always terrible. Honestly, my only mobile editing is patrolling RC and reverting stuff. Reverting, not undoing, because the edit summary was impossible to edit anyway.