There is every tendency that you can be hacked why storing your keys online. However you have power controlling you keys but you must be in charge by taking care of their security.
Hardware wallet is best in time of security.
Hardware wallet isn't the best for two reasons
1. They always need internet connection.
2. You have to keep your private key safe yourself.
Isn't it the same thing with other crypto wallets except from those centralised wallet that gives user no access to their keys?.