A little confused here. Some of the examples you mentioned are already features of obsidian (if not others).

Search all notes that have a certain text as heading? Obsidian’s general search has that. Count number of words in a note or a text selection? That’s generally available in the app.

Do you mean - I would like to reference a note in another note and in the übernote, it should tell me how many words there are in the former note? Maybe a plugin exists for that.

Or the table example - do you want to extract the text and automatically show it in another note?

Isn’t that what note embedding does?

![[OtherNote#^mytable]]

Or, if you want to actually use the data and not just show it, then I believe you need to use DataViews.

Please let us know other examples of use cases that might not be present in Obsidian. You’ve raised an interesting topic!

Also, the people who said that you should put everything in the metadata are idiots or trolls. While you can build metadata over time, it should not be your main focus. The focus should always be your notes.