don't trust and 3rd party in bitcoin world. bitcoin alone have that much safety that no one can steal your money for your wallet. use blockchain wallet that's it and you won't get that much secure wallet. even 3rd party wallets are scam. satoshi had given you enough safety that you can relay on your own for safety. if you trust someone else then you are no longer secure.
You have a point but for a person that really doing bitcoin transactions regularly, it's not mistake if they will use the services of those 3rd party companies that offers some convenient way of sending and receiving bitcoins.
Yes they aren't really safe so just use them for that kind of purposes and not on storage purposes.