Yes, you can delete and move/rename pages, but you need to create an account for that. This is supposed to prevent vandalism. Not sure why would you need a spreadsheet view. You can always use plain search. And than there is semantic search, which I plan to add soon. Having all that data in a structured database (every field/property in a page is query-able in a semantic mediawiki app).

About people vs. startups, you are right, they are no the same. I'm not sure what to call that entity that is something between an idea and a startup. If you create an account you can list your skills in the "Person form". There will be a search for that.