Point to Point? I recall a story from a good few years ago about how hub and spoke works. An agent in Austin needed to book a client up to Dallas and found the flight full. Same day he booked someone Austin/Dallas/New York - same flight Austin/Dallas. OK that can happen but some experimentation showed that he could book to points on the East Coast via Dallas but the Austin/Dallas flight was often full even though he could book beyond Dallas. So he started booking to the East Coast and then cancelling the onward flight from Dallas. The airline took a while to catch on and eventually introduced "married pair" segments - book connecting flights and you can only cancel both, not just one.
There are point to point routes but many cross support one another across a hub.
Then they take into account currency. There are countries with exchange controls that don't allow fares collected to be remitted "home". So you might be able to book A-hub-B but not B-hub-A because the airline can't repatriate the fares they collect from B.
Some of the routes BA operate into Europe offer very strong connections across the Atlantic - even though there are BA customers in the London hub area they can be secondary to the connecting traffic.
Oh and not all the hub traffic originates in Europe think Africa to the USA - very few non stop flights and mostly to East Coast points from Africa. If you want somewhere not served non stop from Africa I'd look at a European hub rather than having to transit somewhere like New York or Miami.