I’m really happy with the new options to modify the appearance of checked items. Would you consider a 3rd appearance option that makes them grayed out AND have a strikethrough? Maybe your concern is legibility, or something else, so feel free to disregard obviously, but I didn’t see anyone else ask.
Also when a checked item is “grayed out” it doesn’t affect any text that has a link. It’d be nice if that was a subdued color as well.