Is there something you'd really like to be able to buy with Bitcoin, but you just can't, yet?
anything offline!
in general i would like to see bitcoin being accepted in offline/ physical / real stores so i can spend bitcoin everywhere like a restaurant or a grocery shop.
You can...
Get a bitcoin debit card, then you can spend bitcoin anywhere.
this is a very good option for spending bitcoin. but at the same time it is not really spending bitcoin "directly" because you are going through a third party and pay extra fees for the service and pay with money in the end.
buying with bitcoin means sending bitcoin directly to the seller.