Here’s a situation I found myself in today: I was working in a big collaborative planning doc with lots of nested lists. It’s overwhelmingly large, so I like to collapse sections I’m not actively working on. As we worked on this plan, we marked areas of uncertainty or future work with certain emojis (e.g. 
for questions, 
for problem areas, etc.)
Now, when I tried to use my browser search to find all the questions, it wasn’t able to find anything inside the collapsed regions. There’s no way to recursively expand all collapsed regions, and the “search this doc” feature at the top of the page doesn’t find any matches for single character searches. Besides, it’s very inconvenient to use for this purpose, since to go to the next matching item, I’d have to go all the way to the top of the page, restart my search, scroll past all the items I’d already looked at, and find the next one.
This is a scenario that happens for me pretty frequently as I work in any kind of long doc with lots of collapsed areas. It would be really nice if either there was a way to recursively expand all collapsed areas in the entire doc so I could search in it, or if standard browser search could be allowed to find content in collapsed regions.