Really love your idea and the app, congratulations!

I will probably start referring to my longer checklists as "steplists" — what a great name!

I noticed that abandoned items in Focus Mode are not specially marked as abandoned in List Mode. I would expect these items to sync in both modes for this state. I also prefer a half-checked state for items in progress; it gives you some instant gratification for starting to work on the next item... but that's just personal preference.