All-in-one wedding venues - I NEED HELP!

I recently got engaged and am looking and a bunch of different options for venues at the moment. I've come across a few "all-in-one" wedding venues, which sounds really appealing in one sense because this would mean I don't have to worry about sourcing catering, decor, venue hire etc., which means I'd have more time to enjoy being engaged and not stress about all the suppliers I'd need to find - but how does this actually work? Are venues flexible with style and what we want or is it mostly like "this is what we have, take it or leave it"? I'm also wondering how we make our wedding unique if we're just going with one of these venues that a bunch of other couples have used - I know it's silly but I would kinda be crushed if someone had the exact same wedding day (as in like copy/pasted event) as me. How do venues mix thing up to make your day unique to you? Sorry... lots of questions in one go... PLEASE HELP ME UNDERSTAND!!! - An already stressed out bride-to-be xx