Until now nobody can hack bitcoin wallet except due to errors and inability of wallet users, we never heard blockchain on hack, it proves that this system is very safe and can be used for safe and convenient transaction
I agree with that, but we now that everything in the internet can be hacked. I know that blockchain and in general web wallets builded to be highly secure, but that doesn't mean that bitcoin web wallet are safe lifetime. I am pretty sure that one day, I will hear that someone can hack a web wallet, because there is some genuis hackers in the world when we talk about black hat for exemple.
So, in conclusion, I can agree that web wallets are top secure, but i can say that is not impossible to hack them.