Of course, in Jaxx there are drawbacks, but the advantages are much greater and they are more than cover small shortcomings of storage. A large number of people use this wallet and consider it one of the best.
The main task of the wallet is to store money, and it copes well with it. During the existence of the wallet, incidents of hacking were recorded, but they were possible only because of the negligent attitude of the users themselves. Nobody has ever managed to hack Jaxx programmatically.
Therefore, we can confidently conclude that it is great for responsible people who understand what security is and how to store their access keys.
It may be better to use hardware or paper storage for storing large amounts of cryptocurrency, but for daily use and frequent transfers of a large number of transactions, this option will be quite convenient and comfortable.