I hesitate to add anything since I’m already dizzy from reading all the other posts. But one common theme is that we want more control over when items are collapsed or expanded.
For me, it came up in a bookmark. After creating the search, I expanded just the items I wanted and got the display exactly how it would be most useful. Next time I used the bookmark, it was all collapsed again. I want it to remember how I left the search!
Also, if you’re looking at a bookmark and want to add something, it immediately collapses. So fast that you can’t even type anything. You have to stop, expand the new but empty item, and then start typing.
There are all sorts of ways and places where we lack control over expanding and collapsing. Don’t overthink it! Just start somewhere and gradually build up the feature until it’s universally available.