I think Bitcoin can be put to a lot of good uses but I'll particularly suggest it to people that travel across the world a lot because that makes you skip a lot of taxes and bureaucracies especially if you're able to identify the local exchanges in whichever country you may find yourself so that you are able to easily convert them into fiat when the need arises.
Yes, it's just an indispensable tool for travel. Do not be afraid that during a trip to another country you can be stolen by money and spoil your holiday.
Well yes it is but at the same time you will have the fear of your wallet being hacked. There is always a threat to the hacking of the account. No matter how secure valet are you using but once if a hacker or a team of hackers decides it to hack it then it will be very much hard to save your BTC in the same wallet.