I find myself wishing for this feature on a daily basis lately, so thought I’d see if it gets any traction amongst other users.
I would love checklist items to auto-sort when one is completed, similar to how iOS Notes checklists work. As soon as you check an item, it sends itself to the bottom of the checklist.
As checklists work currently, you end up with a few completed, a few not, and the list is tough to visually parse. It’s easy to miss an un-checked item near the end of the list.
I could see this behavior being unexpected for some users, so perhaps it could be behind a preference flag.
(LOL ignore my podcast audio that got recorded along with this visual demo 
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